(ROOT (S (NP (NNS Houses)) (VP (VBP fall) (ADVP (RB down))) (. .)))
Houses fall down.
nsubj
Number=Plur
house
Houses
NOUN
NNS
root
Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin
fall
fall
VERB
VBP
advmod
down
down
ADV
RB
punct
.
.
PUNCT
.
(ROOT (S (NP (NNS Trees)) (VP (VBP fall) (PRT (RB over))) (. .)))
Trees fall over.
nsubj
Number=Plur
tree
Trees
NOUN
NNS
root
Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin
fall
fall
VERB
VBP
advmod
over
over
ADV
RB
punct
.
.
PUNCT
.
(ROOT (S (NP (JJ Large) (NNS holes)) (VP (VBP form) (PP (IN in) (NP (DT the) (NN ground)))) (. .)))
Large holes form in the ground.
amod
Degree=Pos
large
Large
ADJ
JJ
nsubj
Number=Plur
hole
holes
NOUN
NNS
root
Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin
form
form
VERB
VBP
case
in
in
ADP
IN
det
Definite=Def|PronType=Art
the
the
DET
DT
obl
Number=Sing
ground
ground
NOUN
NN
punct
.
.
PUNCT
.
(ROOT (SQ (MD Could) (NP (NNP Alaska)) (VP (VB be) (VP (VBG sinking))) (. ?)))
Could Alaska be sinking?
aux
VerbForm=Fin
could
Could
AUX
MD
nsubj
Number=Sing
Alaska
Alaska
PROPN
NNP
aux
VerbForm=Inf
be
be
AUX
VB
root
Tense=Pres|VerbForm=Part
sink
sinking
VERB
VBG
punct
?
?
PUNCT
.
(ROOT (S (S (NP (DT That)) (VP (VBZ 's) (SBAR (WHNP (WP what)) (S (NP (NP (DT some) (NNS villagers)) (PP (IN in) (NP (NNP Alaska)))) (VP (VBP have) (VP (VBN been) (VP (VBG asking) (NP (PRP themselves)) (ADVP (RB recently))))))))) (, --) (CC and) (S (NP (NNS scientists)) (VP (VBP think) (SBAR (S (NP (PRP they)) (VP (VBP know) (WHADVP (WRB why))))))) (. .)))
That's what some villagers in Alaska have been asking themselves recently--and scientists think they know why.
nsubj
Number=Sing|PronType=Dem
that
That
PRON
DT
cop
Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin
be
's
AUX
VBZ
root
PronType=Rel
what
what
PRON
WP
det
some
some
DET
DT
nsubj
Number=Plur
villager
villagers
NOUN
NNS
case
in
in
ADP
IN
nmod
Number=Sing
Alaska
Alaska
PROPN
NNP
aux
Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin
have
have
AUX
VBP
aux
Tense=Past|VerbForm=Part
be
been
AUX
VBN
acl:relcl
Tense=Pres|VerbForm=Part
ask
asking
VERB
VBG
iobj
Case=Acc|Number=Plur|Person=3|PronType=Prs|Reflex=Yes
themselves
themselves
PRON
PRP
advmod
recently
recently
ADV
RB
punct
--
--
PUNCT
,
cc
and
and
CCONJ
CC
nsubj
Number=Plur
scientist
scientists
NOUN
NNS
conj
Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin
think
think
VERB
VBP
nsubj
Case=Nom|Number=Plur|Person=3|PronType=Prs
they
they
PRON
PRP
ccomp
Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin
know
know
VERB
VBP
advmod
PronType=Int
why
why
ADV
WRB
punct
.
.
PUNCT
.
(ROOT (S (NP (JJR Warmer) (NNS temperatures)) (VP (MD may) (VP (VB be) (VP (VBG causing) (S (NP (NP (NNP Alaska) (POS 's)) (VBN frozen) (NN ground)) (VP (TO to) (VP (VB thaw))))))) (. .)))
Warmer temperatures may be causing Alaska's frozen ground to thaw.
amod
Degree=Cmp
warm
Warmer
ADJ
JJR
nsubj
Number=Plur
temperature
temperatures
NOUN
NNS
aux
VerbForm=Fin
may
may
AUX
MD
aux
VerbForm=Inf
be
be
AUX
VB
root
Tense=Pres|VerbForm=Part
cause
causing
VERB
VBG
nmod:poss
Number=Sing
Alaska
Alaska
PROPN
NNP
case
's
's
PART
POS
amod
Tense=Past|VerbForm=Part
freeze
frozen
VERB
VBN
obj
Number=Sing
ground
ground
NOUN
NN
mark
to
to
PART
TO
xcomp
VerbForm=Inf
thaw
thaw
VERB
VB
punct
.
.
PUNCT
.
(ROOT (NFP  ))
root
PUNCT
NFP
(ROOT (S (NP (NP (QP (RB About) (CD 85)) (NN percent)) (PP (IN of) (NP (NP (NNP Alaska) (POS 's)) (NN land) (NN surface)))) (VP (VBZ has) (NP (NN permafrost))) (. .)))
About 85 percent of Alaska's land surface has permafrost.
advmod
about
About
ADV
RB
nummod
NumForm=Digit|NumType=Card
85
85
NUM
CD
nsubj
Number=Sing
percent
percent
NOUN
NN
case
of
of
ADP
IN
nmod:poss
Number=Sing
Alaska
Alaska
PROPN
NNP
case
's
's
PART
POS
compound
Number=Sing
land
land
NOUN
NN
nmod
Number=Sing
surface
surface
NOUN
NN
root
Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin
have
has
VERB
VBZ
obj
Number=Sing
permafrost
permafrost
NOUN
NN
punct
.
.
PUNCT
.
(ROOT (S (NP (NNP Permafrost)) (VP (VBZ supports) (NP (NP (DT the) (NN ground)) (PP (IN above) (NP (PRP it))) (, --) (PP (VBG including) (NP (NNS trees) (, ,) (NNS houses) (, ,) (CC and) (NNS roads))))) (. .)))
Permafrost supports the ground above it--including trees, houses, and roads.
nsubj
Number=Sing
Permafrost
Permafrost
PROPN
NNP
root
Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin
support
supports
VERB
VBZ
det
Definite=Def|PronType=Art
the
the
DET
DT
obj
Number=Sing
ground
ground
NOUN
NN
case
above
above
ADP
IN
obl
Case=Acc|Gender=Neut|Number=Sing|Person=3|PronType=Prs
it
it
PRON
PRP
punct
--
--
PUNCT
,
case
VerbForm=Ger
include
including
VERB
VBG
obl
Number=Plur
tree
trees
NOUN
NNS
punct
,
,
PUNCT
,
conj
Number=Plur
house
houses
NOUN
NNS
punct
,
,
PUNCT
,
cc
and
and
CCONJ
CC
conj
Number=Plur
road
roads
NOUN
NNS
punct
.
.
PUNCT
.
(ROOT (SBARQ (CC But) (WHADVP (WRB why)) (SQ (VBZ is) (NP (DT the) (NN permafrost)) (VP (NN thawing))) (. ?)))
But why is the permafrost thawing?
cc
but
But
CCONJ
CC
advmod
PronType=Int
why
why
ADV
WRB
cop
Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin
be
is
AUX
VBZ
det
Definite=Def|PronType=Art
the
the
DET
DT
compound
Number=Sing
permafrost
permafrost
NOUN
NN
root
Number=Sing
thawing
thawing
NOUN
NN
punct
?
?
PUNCT
.
(ROOT (NFP  ))
root
PUNCT
NFP
(ROOT (S (NP (DT Some) (NNS scientists)) (VP (VBP say) (SBAR (IN that) (S (NP (JJ human-caused) (NN pollution)) (VP (VBZ is) (VP (VBG leading) (PP (IN to) (NP (JJ global) (NN warming)))))))) (. .)))
Some scientists say that human-caused pollution is leading to global warming.
det
some
Some
DET
DT
nsubj
Number=Plur
scientist
scientists
NOUN
NNS
root
Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin
say
say
VERB
VBP
mark
that
that
SCONJ
IN
amod
Degree=Pos
human-caused
human-caused
ADJ
JJ
nsubj
Number=Sing
pollution
pollution
NOUN
NN
aux
Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin
be
is
AUX
VBZ
ccomp
Tense=Pres|VerbForm=Part
lead
leading
VERB
VBG
case
to
to
ADP
IN
amod
Degree=Pos
global
global
ADJ
JJ
obl
Number=Sing
warming
warming
NOUN
NN
punct
.
.
PUNCT
.
(ROOT (S (CC And) (NP (JJS most) (NNS scientists)) (VP (VBP agree) (SBAR (IN that) (S (NP (NNP Alaska)) (VP (VBZ has) (VP (VBN been) (VP (VBG getting) (ADJP (JJR warmer)))))))) (. .)))
And most scientists agree that Alaska has been getting warmer.
cc
and
And
CCONJ
CC
amod
Degree=Sup
most
most
ADJ
JJS
nsubj
Number=Plur
scientist
scientists
NOUN
NNS
root
Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin
agree
agree
VERB
VBP
mark
that
that
SCONJ
IN
nsubj
Number=Sing
Alaska
Alaska
PROPN
NNP
aux
Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin
have
has
AUX
VBZ
aux
Tense=Past|VerbForm=Part
be
been
AUX
VBN
ccomp
Tense=Pres|VerbForm=Part
get
getting
VERB
VBG
xcomp
Degree=Cmp
warm
warmer
ADJ
JJR
punct
.
.
PUNCT
.
(ROOT (S (NP (PRP They)) (VP (VBP say) (SBAR (IN that) (S (NP (DT the) (JJR warmer) (NN temperature)) (VP (VBZ is) (VP (VBG causing) (S (NP (NN permafrost)) (VP (TO to) (VP (VB thaw) (PP (IN in) (NP (DT some) (NNS areas))))))))))) (. .)))
They say that the warmer temperature is causing permafrost to thaw in some areas.
nsubj
Case=Nom|Number=Plur|Person=3|PronType=Prs
they
They
PRON
PRP
root
Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin
say
say
VERB
VBP
mark
that
that
SCONJ
IN
det
Definite=Def|PronType=Art
the
the
DET
DT
amod
Degree=Cmp
warm
warmer
ADJ
JJR
nsubj
Number=Sing
temperature
temperature
NOUN
NN
aux
Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin
be
is
AUX
VBZ
ccomp
Tense=Pres|VerbForm=Part
cause
causing
VERB
VBG
obj
Number=Sing
permafrost
permafrost
NOUN
NN
mark
to
to
PART
TO
xcomp
VerbForm=Inf
thaw
thaw
VERB
VB
case
in
in
ADP
IN
det
some
some
DET
DT
obl
Number=Plur
area
areas
NOUN
NNS
punct
.
.
PUNCT
.
(ROOT (S (NP (DT The) (NN thawing) (NN permafrost)) (VP (MD can) (VP (VB cause) (NP (NNS problems)) (PP (IN for) (NP (NNS people) (, ,) (NNS plants) (, ,) (CC and) (NNS animals))))) (. .)))
The thawing permafrost can cause problems for people, plants, and animals.
det
Definite=Def|PronType=Art
the
The
DET
DT
compound
Number=Sing
thawing
thawing
NOUN
NN
nsubj
Number=Sing
permafrost
permafrost
NOUN
NN
aux
VerbForm=Fin
can
can
AUX
MD
root
VerbForm=Inf
cause
cause
VERB
VB
obj
Number=Plur
problem
problems
NOUN
NNS
case
for
for
ADP
IN
nmod
Number=Plur
person
people
NOUN
NNS
punct
,
,
PUNCT
,
conj
Number=Plur
plant
plants
NOUN
NNS
punct
,
,
PUNCT
,
cc
and
and
CCONJ
CC
conj
Number=Plur
animal
animals
NOUN
NNS
punct
.
.
PUNCT
.
(ROOT (NFP  ))
root
PUNCT
NFP
(ROOT (S (`` ``) (S (S (NP (DT The) (NN collapsing)) (VP (VBZ is) (NP (DT a) (NN problem)) (PP (IN in) (NP (NP (NP (DT the) (NNS villages)) (PP (IN in) (NP (NNP Alaska)))) (SBAR (WHNP (WDT which)) (S (VP (VBP are) (VP (VBN built) (PP (IN on) (NP (NN permafrost))))))))))) (, ,) (CC and) (S (NP (NP (DT some)) (PP (IN of) (NP (PRP them)))) (VP (MD may) (VP (VB have) (S (VP (TO to) (VP (VB move) (PP (IN to) (NP (NP (JJR safer) (NN ground)) (, ,) (SBAR (WHADVP (WRB where)) (S (NP (EX there)) (VP (VBZ is) (NP (DT no) (NN permafrost)))))))))))))) (, ,) ('' '') (NP (NNP Weller)) (VP (VBD said)) (. .)))
"The collapsing is a problem in the villages in Alaska which are built on permafrost, and some of them may have to move to safer ground, where there is no permafrost," Weller said.
punct
``
``
PUNCT
``
det
Definite=Def|PronType=Art
the
The
DET
DT
nsubj
Number=Sing
collapse
collapsing
NOUN
NN
cop
Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin
be
is
AUX
VBZ
det
Definite=Ind|PronType=Art
a
a
DET
DT
ccomp
Number=Sing
problem
problem
NOUN
NN
case
in
in
ADP
IN
det
Definite=Def|PronType=Art
the
the
DET
DT
nmod
Number=Plur
village
villages
NOUN
NNS
case
in
in
ADP
IN
nmod
Number=Sing
Alaska
Alaska
PROPN
NNP
nsubj:pass
PronType=Rel
which
which
PRON
WDT
aux:pass
Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin
be
are
AUX
VBP
acl:relcl
Tense=Past|VerbForm=Part|Voice=Pass
build
built
VERB
VBN
case
on
on
ADP
IN
obl
Number=Sing
permafrost
permafrost
NOUN
NN
punct
,
,
PUNCT
,
cc
and
and
CCONJ
CC
nsubj
some
some
DET
DT
case
of
of
ADP
IN
nmod
Case=Acc|Number=Plur|Person=3|PronType=Prs
they
them
PRON
PRP
aux
VerbForm=Fin
may
may
AUX
MD
conj
VerbForm=Inf
have
have
VERB
VB
mark
to
to
PART
TO
xcomp
VerbForm=Inf
move
move
VERB
VB
case
to
to
ADP
IN
amod
Degree=Cmp
safe
safer
ADJ
JJR
obl
Number=Sing
ground
ground
NOUN
NN
punct
,
,
PUNCT
,
advmod
PronType=Rel
where
where
ADV
WRB
expl
there
there
PRON
EX
acl:relcl
Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin
be
is
VERB
VBZ
det
no
no
DET
DT
nsubj
Number=Sing
permafrost
permafrost
NOUN
NN
punct
,
,
PUNCT
,
punct
''
''
PUNCT
''
nsubj
Number=Sing
Weller
Weller
PROPN
NNP
root
Mood=Ind|Number=Sing|Person=3|Tense=Past|VerbForm=Fin
say
said
VERB
VBD
punct
.
.
PUNCT
.
(ROOT (NFP  ))
root
PUNCT
NFP
(ROOT (S (NP (NP (DT The) (JJ Alaskan) (NN town)) (PP (IN of) (NP (NNP Glennallen)))) (VP (VBD saw) (NP (PRP$ its) (JJ old) (NML (NN post) (NN office)) (NN collapse))) (. .)))
The Alaskan town of Glennallen saw its old post office collapse.
det
Definite=Def|PronType=Art
the
The
DET
DT
amod
Degree=Pos
alaskan
Alaskan
ADJ
JJ
nsubj
Number=Sing
town
town
NOUN
NN
case
of
of
ADP
IN
nmod
Number=Sing
Glennallen
Glennallen
PROPN
NNP
root
Mood=Ind|Number=Sing|Person=3|Tense=Past|VerbForm=Fin
see
saw
VERB
VBD
nmod:poss
Case=Gen|Gender=Neut|Number=Sing|Person=3|Poss=Yes|PronType=Prs
its
its
PRON
PRP$
amod
Degree=Pos
old
old
ADJ
JJ
compound
Number=Sing
post
post
NOUN
NN
compound
Number=Sing
office
office
NOUN
NN
obj
Number=Sing
collapse
collapse
NOUN
NN
punct
.
.
PUNCT
.
(ROOT (S (CC And) (, ,) (PP (VBG according) (PP (IN to) (NP (NP (NNP James) (NNP Walters)) (, ,) (NP (NP (DT a) (NN permafrost) (NN expert)) (PP (IN at) (NP (NP (DT the) (NNP University)) (PP (IN of) (NP (NNP Northern) (NNP Iowa))))))))) (, ,) (NP (NN house-moving) (NNS companies)) (VP (VBP have) (VP (VBN been) (ADJP (RB very) (JJ busy)))) (. .)))
And, according to James Walters, a permafrost expert at the University of Northern Iowa, house-moving companies have been very busy.
cc
and
And
CCONJ
CC
punct
,
,
PUNCT
,
case
ExtPos=ADP|VerbForm=Ger
accord
according
VERB
VBG
fixed
to
to
ADP
IN
obl
Number=Sing
James
James
PROPN
NNP
flat
Number=Sing
Walters
Walters
PROPN
NNP
punct
,
,
PUNCT
,
det
Definite=Ind|PronType=Art
a
a
DET
DT
compound
Number=Sing
permafrost
permafrost
NOUN
NN
appos
Number=Sing
expert
expert
NOUN
NN
case
at
at
ADP
IN
det
Definite=Def|PronType=Art
the
the
DET
DT
nmod
Number=Sing
University
University
PROPN
NNP
case
of
of
ADP
IN
amod
Degree=Pos
Northern
Northern
ADJ
NNP
nmod
Number=Sing
Iowa
Iowa
PROPN
NNP
punct
,
,
PUNCT
,
compound
Number=Sing
house-moving
house-moving
NOUN
NN
nsubj
Number=Plur
company
companies
NOUN
NNS
aux
Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin
have
have
AUX
VBP
cop
Tense=Past|VerbForm=Part
be
been
AUX
VBN
advmod
very
very
ADV
RB
root
Degree=Pos
busy
busy
ADJ
JJ
punct
.
.
PUNCT
.
(ROOT (NFP  ))
root
PUNCT
NFP
(ROOT (S (`` ``) (S (NP (NN Melting) (NN permafrost)) (VP (MD can) (ADVP (RB also)) (VP (VB destroy) (NP (NNS trees) (CC and) (NNS forests))))) (, ,) ('' '') (NP (NNP Weller)) (VP (VBD said)) (. .)))
"Melting permafrost can also destroy trees and forests," Weller said.
punct
``
``
PUNCT
``
compound
Number=Sing
melting
Melting
NOUN
NN
nsubj
Number=Sing
permafrost
permafrost
NOUN
NN
aux
VerbForm=Fin
can
can
AUX
MD
advmod
also
also
ADV
RB
ccomp
VerbForm=Inf
destroy
destroy
VERB
VB
obj
Number=Plur
tree
trees
NOUN
NNS
cc
and
and
CCONJ
CC
conj
Number=Plur
forest
forests
NOUN
NNS
punct
,
,
PUNCT
,
punct
''
''
PUNCT
''
nsubj
Number=Sing
Weller
Weller
PROPN
NNP
root
Mood=Ind|Number=Sing|Person=3|Tense=Past|VerbForm=Fin
say
said
VERB
VBD
punct
.
.
PUNCT
.
(ROOT (S (`` ``) (SBAR (WHADVP (WRB When)) (NP (NP (NNS holes)) (PP (IN in) (NP (DT the) (NN ground) (NN form))))) (, ,) (NP (NNS trees)) (VP (VP (VBP fall) (PP (IN into) (NP (PRP them)))) (CC and) (VP (VBP die))) (. .)))
"When holes in the ground form, trees fall into them and die.
punct
``
``
PUNCT
``
advmod
PronType=Int
when
When
ADV
WRB
advcl
Number=Plur
hole
holes
NOUN
NNS
case
in
in
ADP
IN
det
Definite=Def|PronType=Art
the
the
DET
DT
compound
Number=Sing
ground
ground
NOUN
NN
nmod
Number=Sing
form
form
NOUN
NN
punct
,
,
PUNCT
,
nsubj
Number=Plur
tree
trees
NOUN
NNS
root
Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin
fall
fall
VERB
VBP
case
into
into
ADP
IN
obl
Case=Acc|Number=Plur|Person=3|PronType=Prs
they
them
PRON
PRP
cc
and
and
CCONJ
CC
conj
Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin
die
die
VERB
VBP
punct
.
.
PUNCT
.
(ROOT (S (S (NP (DT This)) (VP (MD could) (VP (VB turn) (NP (DT a) (NN forest)) (PP (IN into) (NP (DT a) (NN swamp)))))) (, ,) (CC and) (S (NP (NP (NNS animals)) (SBAR (WHNP (WDT which)) (S (VP (VBP need) (NP (DT the) (NN forest)))))) (VP (MD will) (VP (VB have) (S (VP (TO to) (VP (VB move) (ADVP (RB elsewhere)))))))) (. .) ('' '')))
This could turn a forest into a swamp, and animals which need the forest will have to move elsewhere."
nsubj
Number=Sing|PronType=Dem
this
This
PRON
DT
aux
VerbForm=Fin
could
could
AUX
MD
root
VerbForm=Inf
turn
turn
VERB
VB
det
Definite=Ind|PronType=Art
a
a
DET
DT
obj
Number=Sing
forest
forest
NOUN
NN
case
into
into
ADP
IN
det
Definite=Ind|PronType=Art
a
a
DET
DT
obl
Number=Sing
swamp
swamp
NOUN
NN
punct
,
,
PUNCT
,
cc
and
and
CCONJ
CC
nsubj
Number=Plur
animal
animals
NOUN
NNS
nsubj
PronType=Rel
which
which
PRON
WDT
acl:relcl
Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin
need
need
VERB
VBP
det
Definite=Def|PronType=Art
the
the
DET
DT
obj
Number=Sing
forest
forest
NOUN
NN
aux
VerbForm=Fin
will
will
AUX
MD
conj
VerbForm=Inf
have
have
VERB
VB
mark
to
to
PART
TO
xcomp
VerbForm=Inf
move
move
VERB
VB
advmod
elsewhere
elsewhere
ADV
RB
punct
.
.
PUNCT
.
punct
''
''
PUNCT
''
(ROOT (NFP  ))
root
PUNCT
NFP
(ROOT (S (NP (DT The) (NN melting)) (VP (MD could) (VP (VB cause) (`` ``) (NP (JJ severe) (NNS problems)))) (. .) ('' '')))
The melting could cause "severe problems."
det
Definite=Def|PronType=Art
the
The
DET
DT
nsubj
Number=Sing
melting
melting
NOUN
NN
aux
VerbForm=Fin
could
could
AUX
MD
root
VerbForm=Inf
cause
cause
VERB
VB
punct
``
``
PUNCT
``
amod
Degree=Pos
severe
severe
ADJ
JJ
obj
Number=Plur
problem
problems
NOUN
NNS
punct
.
.
PUNCT
.
punct
''
''
PUNCT
''
(ROOT (S (NP (NNP Weller)) (VP (VBZ says) (: :) (`` ``) (S (S (NP (DT This)) (VP (MD could) (VP (VB take) (NP (NP (NNS hundreds)) (PP (IN of) (NP (NNS years))))))) (, ,) (CC but) (S (PP (IN in) (NP (DT the) (NN end))) (NP (NNP Alaska)) (VP (MD will) (VP (VB look) (ADJP (RB quite) (JJ different)) (PP (IN from) (SBAR (WHNP (WP what)) (S (NP (PRP it)) (VP (VBZ looks) (PP (IN like)) (ADVP (RB now))))))))))) (. .) ('' '')))
Weller says: "This could take hundreds of years, but in the end Alaska will look quite different from what it looks like now."
nsubj
Number=Sing
Weller
Weller
PROPN
NNP
root
Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin
say
says
VERB
VBZ
punct
:
:
PUNCT
:
punct
``
``
PUNCT
``
nsubj
Number=Sing|PronType=Dem
this
This
PRON
DT
aux
VerbForm=Fin
could
could
AUX
MD
ccomp
VerbForm=Inf
take
take
VERB
VB
obj
Number=Plur
hundred
hundreds
NOUN
NNS
case
of
of
ADP
IN
nmod
Number=Plur
year
years
NOUN
NNS
punct
,
,
PUNCT
,
cc
but
but
CCONJ
CC
case
in
in
ADP
IN
det
Definite=Def|PronType=Art
the
the
DET
DT
obl
Number=Sing
end
end
NOUN
NN
nsubj
Number=Sing
Alaska
Alaska
PROPN
NNP
aux
VerbForm=Fin
will
will
AUX
MD
conj
VerbForm=Inf
look
look
VERB
VB
advmod
quite
quite
ADV
RB
xcomp
Degree=Pos
different
different
ADJ
JJ
case
from
from
ADP
IN
obl
PronType=Rel
what
what
PRON
WP
nsubj
Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs
it
it
PRON
PRP
acl:relcl
Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin
look
looks
VERB
VBZ
obl
like
like
ADP
IN
advmod
now
now
ADV
RB
punct
.
.
PUNCT
.
punct
''
''
PUNCT
''
Houses fall down. Trees fall over. Large holes form in the ground. Could Alaska be sinking? That's what some villagers in Alaska have been asking themselves recently--and scientists think they know why. Warmer temperatures may be causing Alaska's frozen ground to thaw.  About 85 percent of Alaska's land surface has permafrost. Permafrost supports the ground above it--including trees, houses, and roads. But why is the permafrost thawing?  Some scientists say that human-caused pollution is leading to global warming. And most scientists agree that Alaska has been getting warmer. They say that the warmer temperature is causing permafrost to thaw in some areas. The thawing permafrost can cause problems for people, plants, and animals.  "The collapsing is a problem in the villages in Alaska which are built on permafrost, and some of them may have to move to safer ground, where there is no permafrost," Weller said.  The Alaskan town of Glennallen saw its old post office collapse. And, according to James Walters, a permafrost expert at the University of Northern Iowa, house-moving companies have been very busy.  "Melting permafrost can also destroy trees and forests," Weller said. "When holes in the ground form, trees fall into them and die. This could turn a forest into a swamp, and animals which need the forest will have to move elsewhere."  The melting could cause "severe problems." Weller says: "This could take hundreds of years, but in the end Alaska will look quite different from what it looks like now."