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Despite widely differing perspectives and agendas, there seems to be a remarkable global consensus that has built up over a fairly short period of time that climate change and ecology is one of the truly defining issues for humanity.

Address these environmental issues and you will address every issue known to man. And we keep dabbling in things that aren't really that important in the long term.

I think there are changes in the environment. There are a lot of items to contribute to it.

I think that its easy to think of the environment as all doom and gloom and that, 'What can we do, it's too late. And the polar bears are gone, and everything is gone.' But really, just the little steps that we can make as individuals make a big difference.

We are losing our environment so rapidly.

Climate change is happening, humans are causing it, and I think this is perhaps the most serious environmental issue facing us.

I have long understood that climate change is not only an environmental issue - it is a humanitarian, economic, health, and justice issue as well.

All our environmental problems become easier to solve with fewer people and harder - and ultimately impossible to solve - with ever more people.

Just as human activity is upsetting Earth's carbon cycle, our actions are altering the water cycle.

Climate change has been going on as long as the planet is here, and there will always be a little bit of it.