James Hansen

"Technology alone cannot solve the climate crisis without policy change."

"The climate system has tipping points we must not cross."

"Political leaders have failed to respond adequately to climate science."

"We have the solutions; what we lack is the political will."

"The climate crisis threatens everything we value."

"We must transition rapidly to clean energy."

"The evidence from ice cores and atmospheric data is unambiguous."

"We cannot rely on fossil fuel companies to solve the climate crisis."

"Children will ask us why we didn't act when we knew what was happening."

"The Paris Agreement targets are insufficient to prevent dangerous warming."

"We need a real price on carbon, not empty promises."

"Climate change is already affecting food security globally."

"The melting of ice sheets is accelerating faster than models predicted."

"We must protect natural ecosystems as our best defense against climate change."

"Renewable energy is now economically competitive with fossil fuels."

"The job market will be stronger if we transition to clean energy."

"We have the knowledge to prevent the worst outcomes."

"Political courage is what we need now, not more studies."

"The climate crisis will create millions of climate refugees."

"We must stop subsidizing fossil fuels immediately."

"The younger generation has a right to demand climate action."

"Our energy system must be rebuilt within this decade."

"Climate change affects the poorest nations most severely."

"The scientific consensus on climate change is overwhelming and clear."

"We cannot negotiate with the laws of physics."

"Carbon dioxide will remain in the atmosphere for centuries."

"Economic models must account for the true cost of environmental damage."

"The Arctic is warming twice as fast as the rest of the planet."

"We need governments to regulate emissions effectively."

"Climate change is the defining challenge of our time."