Century Quote by Paul R. Ehrlich

If we don't start thinking big about the CO2 problem, we may miss our opportunity to stop a climate runaway that will trash the…

— William H. Calvin

The warming we've experienced in the late 20th century could just as easily be explained by small decreases in cloud cover - natural changes…

— Willie Soon

Climate change is one of the issues I worry most about because its impacts are enormous. But they're gradual, they're not immediate.

— Barack Obama

The problem is we don't know what the climate is doing. We thought we knew 20 years ago. That led to some alarmist books…

— James Lovelock

Climate change: We have never faced a more critical time on our planet

— Richard Leakey

Make no mistake: Tackling climate change is vital. But to see everything through the lens of short-term CO2 reductions, letting our obsession with carbon…

— Alex Steffen

We face the gravest threat that civilization has ever confronted. It's global in nature and requires a global solution. Increased CO2 emissions anywhere, whether…

— Al Gore

The problem is we don’t know what the climate is doing. We thought we knew 20 years ago. That led to some alarmist books…

— James Lovelock

There's no happy ending where we prevent climate change any more. Now the question is, is it going to be a miserable century or…

— Bill McKibben

“Why have global temperatures not risen in the best part of two decades while CO2 levels have kept on rising? •    ”

— Alan Carlin

We thought we knew 20 years ago. That led to some alarmist books – mine included – because it looked clear-cut, but it hasn’t…

— James Lovelock

The more the climate is forced to change, the more likely it is to hit some unforeseen threshold that can trigger quite fast, surprising…

— Richard Alley