James Hansen

"The fossil fuel industry's influence on policy is one of the greatest failures of democracy."

"Future generations will judge us not by our intentions, but by our actions."

"Ice sheets are melting faster than our models predicted - nature is ahead of our worst fears."

"We must distinguish between what is politically possible and what is physically necessary."

"The greatest tragedy would be to understand the problem too late to do anything about it."

"Children deserve to inherit a world at least as good as the one we were given."

"Science requires honesty - even when the truth is uncomfortable."

"The window of opportunity to prevent catastrophic climate change is closing."

"We are conducting a global experiment on the only planet we have."

"Renewable energy is not a sacrifice - it is a foundation for sustainable prosperity."

"The data speaks clearly to those willing to listen."

"We have the knowledge and technology to address climate change - what we lack is political will."

"History will remember this as the moment when we understood the stakes and had to choose."

"The Arctic is warming twice as fast as the rest of the planet - this is not a prediction, it is an observation."

"Short-term profits should not override long-term planetary health."

"Every person's carbon footprint matters in the aggregate."

"The beauty of science is that it is objective - the truth is the truth regardless of our beliefs."

"We must act with the urgency that the science demands, not the urgency that politics allows."

"Future generations will have every right to condemn our generation for failing to act."

"The climate crisis is fundamentally a crisis of values."

"We are borrowing this planet from our children - we have no right to damage it."

"The evidence for human-caused climate change is overwhelming and continues to strengthen."

"Small actions at scale create meaningful change."

"Nature does not negotiate - it responds to the laws of physics."

"Our generation has been called to be stewards of the planet in a way no other generation has."

"The transition away from fossil fuels is inevitable - the only question is whether it happens before or after catastrophe."

"We must allow young people to have a voice in decisions that will determine their future."

"The climate system responds to the total amount of greenhouse gases in the atmosphere, not just current emissions."

"Inertia in the climate system means we are already committed to significant warming."

"The most important investment we can make is in education about climate science."