 your opinion,” the executive shot back, clearly irritated. “A majority of Americans support nuclear power.” That may or may not be true, depending on whose poll you trust. But it makes a great corporate talking point.
Back at the local government conference in Roanoke and the clean energy breakout session, I was glad to see that I wasn’t the only one at the table who winced at the thought of uranium mining.
A councilwoman and a couple of consultants from the liberal, eco-aware Washington, DC suburbs looked equally nonplussed. Aside from uranium’s role in nuclear reactors, the big issue behind the statewide ban was potential contamination of water supplies for densely populated coastal communities downstream.
“More natural gas buses,” one of the consultants suggested. Head nodding all around. Turns out, the state offers grants to help cities convert their fleets to run on compressed natural gas.
Of course gas had to come up as clean energy. All too many greens in big metro areas believe the industry line that natural gas is a much cleaner fuel than oil for transportation. But the big selling point of gas is replacing coal to generate baseload electric power.
You have to live pretty far from gas production, done these days largely by fracking, to think that gas is clean.
If only more big city and suburban liberals had seen the two Gasland documentaries by Josh Fox, they’d know how hated natural gas is for fouling home wells and town water supplies alike in rural communities that have been fracked from Colorado to Pennsylvania.
And when you throw in the methane leaks during production that may make natural gas as dirty as coal in terms of greenhouse gas emissions, then you need a lot of confidence in the industry to keep believing that natural gas is a clean fuel.
Secondly, people like “clean” things. Generally, cleanliness is considered a good thing. And, in this context, “clean” is the opposite of polluting, and pollution is widely considered to be bad. So, when speaking about whatever technologies you support (even if they are not clean in some people’s eyes, such as natural gas and nuclear energy), using a term that has a very positive connotation is popular.
Thirdly…well…with the term becoming more and more popular, it just makes sense to use it more (it’s a cycle).
So I understand that many people who support renewables will agree with Clean Technica that “clean energy” is the best way to talk about solar, wind, hydro, geothermal and other no-carbon or low-carbon energy sources.
But after learning how the Virginia Energy Plan views clean energy, I won’t be one of them.
Instead, the next time somebody talks about clean energy, I’m going to be suspicious. Are they just trying to sell me dangerous old wine in new green bottles?
At the Roanoke conference breakout session on clean energy, we concluded our discussion with the surreal exercise of brainstorming ideas on how best to spread this kind of energy more quickly around the state. At the time, I just couldn’t tap my usual eagerness to give free marketing advice.
But now I think that perhaps they should try milling the uranium on the lawn in front of the state capitol. There’s a nice clear spot around the corner from the statue of George Washington.
Reposted from ErikCurren.com.
Clean energy? All that equipment used to create so called renewable energy is mined and manufactured with fossil fuel and the ecosystems where they are placed are destroyed in the process. Clean energy isn’t picked from a tree. The only clean energy is no energy.
Yes, you’re right Ronnie, even solar needs oil to make, ship and market the panels. Now if only our mainstream business leaders and politicians had any sense of this. Instead, they’re so far from considering the true cost of any energy that they’re still pushing sources that have much more impact than solar panels, especially fracked gas and nukes. If I had to choose, I’d certainly ask for solar on a million rooftops over a new nuclear plant.
The debate’s so confused at the moment, too many vested interests and yet little interest for the people on the planet. Bizarre stuff, really.Q: How to access as functions in kivy + python I'm trying to create an app for student presence control and I'm not getting access to a function inside a class in python.
I have tried in many ways without success.
arq.py
class Tela(ScreenManager):
    pass
class Chamada(Screen):
    def chamada_func(self):
        self.ids.grid.add_widget(Label(text = 'teste')) 
        #I would like to press the call button, add the grid label

class Nota(Screen):
    pass
class Prg(App):
    def build(self):
        self.Chamada = Chamada()
        return Tela()

Prg().run()

arq.kv
<Tela>:
    Screen:
        name: 'Principal'
        BoxLayout:
            id: box_principal
            orientation:'vertical'
            padding: 50
            spacing: 100
            Button:
                text: 'Chamada'
                on_release: root.current = 'Chamada'
            Button:
                text: 'Nota'
                on_release: root.current = 'Nota'   
            Button:
                text: 'Sair'
    Chamada:
        name: 'Chamada'
        BoxLayout:
            id: box_chamada
            orientation:'vertical'
            GridLayout:
                id: grid


A: Question 2

use this on a button inside the  class: how would it be?

Solution 2: kv file - Invoke a method from the class that implemented it
The following solution illustrates how to invoke the method, chamada_func() implemented in class Chamada() from another children within the class via kv file.
        on_release: root.chamada_func()

Snippets
<Chamada>:
    name: 'Chamada'

    BoxLayout:
        id: box_chamada
        orientation:'vertical'

        GridLayout:
            id: grid

        Button:
            text: 'ok'
            size_hint: 1, 0.05
            on_release: root.chamada_func()

Question 1

How to access a function?

Solution 1: kv file - Invoke a method from another class / screen
The following solution illustrates how to invoke the method, chamada_func() implemented in class Chamada() from another class / screen in kv file.


*

*Add an id: chamada to screen, Chamada:

*Invoke method with on_release: root.ids.chamada.chamada_func()

*Remove self.Chamada = Chamada() from build() method because you don't want two instances of object, Chamada. On top of that, the instance instantiated in the kv file will have a view / presentation, while the other one instantiated in the build method does not have a view.

*In kv file, add a class rule, <Chamada>:
Snippets

main.py

class Tela(ScreenManager):
    pass

class Chamada(Screen):
    def chamada_func(self):
        self.ids.grid.add_widget(Label(text = 'teste')) 


class Nota(Screen):
    pass


class Prg(App):
    def build(self):
        return Tela()

Prg().run()


kv file

<Tela>:
    Screen:
        name: 'Principal'
        BoxLayout:
            id: box_principal
            orientation:'vertical'
            padding: 50
            spacing: 100
            Button:
                text: 'Chamada'
                on_release: 
                    root.ids.chamada.chamada_func()
                    root.current = 'Chamada'
            Button:
                text: 'Nota'
                on_release: root.current = 'Nota'   
            Button:
                text: 'Sair'
    Chamada:
        id: chamada

<Chamada>:
    name: 'Chamada'

    BoxLayout:
        id: box_chamada
        orientation:'vertical'

        GridLayout:
            id: grid

        Button:
            text: 'ok'
            size_hint: 1, 0.05
            on_release: root.chamada_func()

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