Should inaction be a crime? Six young people from Portugal are challenging European countries. They say they have not done enough to stop climate change.
Six young people sue 32 nations over climate
Activists: The six Portuguese youths who have filed a case in the European Court of Human Rights. Glossary
Portugal - A southern European country next to Spain. It has a population of 10 million.
Anxious - Worried.
Asthma - A common lung condition that can cause breathing difficulties.
Sue - Start a legal fight against someone or something.
Accuse - Say you think someone has done something wrong.
Human rights - The basic rights and freedoms that belong to every person in the world, from birth until death. They apply regardless of where you are from, what you believe or how you choose to live your life. Some have called for animals and even natural phenomena like rivers to have some form of human rights.
Climate change - Long-term shifts in temperatures and weather patterns. Human action is a major cause of climate change.
Montana - A state in the northwest of the US known for its mountainous landscape.
Crime - Sex between men was first made illegal in England by Henry VIII in 1533. It was decriminalised in 1967.
Fossil fuels - Fuels made from decomposing plants and animals, including coal, natural gas and oil. These fuels release carbon dioxide, causing global warming.
Blame - Responsible for a bad thing happening.