about 60% of the warming observed from 1970 to 2000 was very likely caused by the above natural 60-year climatic cycle during its warming phase" (loehle and scafetta)
about 60% of the warming observed from 1970 to 2000 was very likely caused by the above natural 60-year climatic cycle during its warming phase" (loehle and scafetta)
global warming:55
before the industrial revolution, naturally occurring amounts of greenhouse gases caused the air near the surface to be warmer by about 33 °c (59 °f) than it would be in their absence.