A new global survey illustrates the depth of anxiety many young people are feeling about climate change.
More than 45% of those questioned said feelings about the climate affected their daily lives.
Three-quarters of them said they thought the future was frightening. Over half (56%) say they think humanity is doomed.
Two-thirds reported feeling sad, afraid and anxious. Many felt fear, anger, despair, grief and shame - as well as hope.
The survey across 10 countries was led by Bath University in collaboration with five universities. It's funded by the campaign and research group Avaaz. It claims to be the biggest of its kind, with responses from 10,000 people aged between 16 and 25.
Many of those questioned perceive that they have no future, that humanity is doomed.
The authors say the young are confused by governments' failure to act. They say environmental fears are "profoundly affecting huge numbers of young people".