By the time we see that climate change is really bad, your ability to fix it is extremely limited... The carbon gets up there, but the heating effect is delayed. And then the effect of that heat on the species and ecosystem is delayed. That means that even when you turn virtuous, things are actually going to get worse for quite a while.

We actually all care about the environment, and most people believe in climate change and believe that mankind has something to do with that - how much is scientifically debatable, but there is some effect and we all have an interest in reducing carbon emissions, just having cleaner air, cleaner oceans. It's something we can get behind.

The Environmental Protection Agency's first-ever limits on carbon pollution from power plants will create clean- energy jobs, improve public health, bring greater reliability to our electric power grid, bolster our national security, demonstrate the United States' resolve to combat climate change and maybe even reduce our utility bills.

It's very clear that global climate change is occurring on earth, but it's also been very clear that that has always happened on earth. We've always had a changing climate on earth. We all know about ice ages. We know when our continent was covered with ice sheets. We know glaciers come and they go. It puzzles me that people forget that.

If you compare Everest photographs in 1953 with its current state, things are melting. I imagine if I were a golfer in Indiana, I'd be hard-pressed to believe in climate change because nothing's going on there. But when you're up in the mountains and seeing the glaciers melt away, it's an obvious physical manifestation of a warming planet.

I have to say that if our global alliances are going to be alliances with Hezbollah and Hamas and Hugo Chavez's Venezuela and Vladimir Putin's Russia, there is absolutely no chance of building a world-wide alliance that can deal with poverty and inequality and climate change and financial instability, and we've got to face up to that fact.

We have to overthrow the idea that it's a diversion from 'real' work when scientists conduct high-quality research in the open. Publicly funded science should be open science. Improving the way that science is done means speeding us along in curing cancer, solving the problem of climate change and launching humanity permanently into space.

Democrats pride themselves on their commitment to science. Citing climate change, they contend that they are the party of truth, while Republicans are 'denialists.' But with respect to genetically modified organisms, many Democrats seem indifferent to science, and to be practicing a denialism of their own - perhaps more so than Republicans.

My experience as energy and climate change secretary - in the months I spent battling George Osborne over the budget for investment in low carbon, and in the daily attrition with Eric Pickles over onshore wind - was that many Conservatives simply regard their commitment to climate change action as something they had to say to get into power.

The specter of climate change threatens worsening natural disasters, rapid urbanization, forced migration, and economic hardship for the most vulnerable. Despite significant global advances, inability to effectively address epidemics and health emergencies still prevail and continuously threaten global health security and economic development.

I listen to audiobooks: the last one was Vivienne Westwood's biography. She's the most amazing woman. The way she's used her platform in fashion to be an activist and promote causes like global warming, climate change, and inequality in the world... It gives high fashion, what seems like it can be 'for a certain group,' a way to help real causes.

Hydroelectric dams remain the way many poor countries gain access to reliable electricity, and both solar and wind might be worthwhile in some circumstances. But there is nothing in either their history or their physical attributes that suggests solar and wind in particular could or should be the centerpiece of efforts to deal with climate change.

Anybody who doesn't see the impact of climate change is really, I would say, myopic. They don't see the reality. It's so evident that we are destroying Mother Earth. This is not the problem of one country or a few countries: it is the problem of mankind. We need to work together to stop this. Otherwise, our future generations will simply disappear.

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