Have we missed our chance to stop global warming? A new report has warned that the world is on track to hit a 1.5C temperature increase by 2027.
World on track to break 1.5C climate target
Heating up: If the 1.5C limit is broken, the world will be heading into "uncharted territory", experts say. Glossary
Climate change - Long-term shifts in temperatures and weather patterns. Human action is a major cause of climate change.
Paris Agreement - An agreement signed by 196 countries to try to limit global warming.
Pessimism - Always expecting the worst.
Greenhouse gas - Gases in the Earth's atmosphere that trap heat, contributing to global warming. Carbon dioxide, methane, nitrous oxide and water vapour are all greenhouse gases.
Carbon capture - Technology which captures carbon dioxide from the air and transports it to storage sites underwater, preventing it from warming the atmosphere.
Industrial Revolution - A period of sudden, rapid industrialisation that transforms a country from an agricultural to an industrial economy.