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Our climate is always changing.

The climate has been changing since there was a climate.

The environment will continue to deteriorate until pollution practices are abandoned.

I think the climate has been changing for billions of years.

The climate is changing; I don't think you can deny that. But climate has always changed.

As species are exterminated by shifting climate zones, ecosystems can collapse, destroying more species.

As somebody who's been writing about this subject for getting on twenty years now, it's astonishing how the climate has changed in the last five years.

The whole climate is changing: the winds, the ocean currents, the storm patterns, snow packs, snowmelt, flooding, droughts. Temperature is just a bit of it.

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.

The fact is fossil fuel carbon will stay in the surface climate system for millennia.