fossil fuels
'UCL, UCL, don't put us in climate hell.'
"I think people are going to tell me we're crazy."
Researchers say the only way to reduce warming to a safe level is to close many coal, gas and oil extractions earlier than planned.
Can we all move to Costa Rica?
The country produced 106% of its daily requirement.
'We don't have answers for trucks, but we do for cars'