a natural event such as a flood, earthquake, or tsunami that kills or injures a lot of people

a measurement of the amount of carbon dioxide produced by the activities of a person, company, organization, etc.

fuels, such as gas, coal, and oil, that were formed underground from plant and animal remains millions of years ago

energy that is produced by dividing atoms

to make something dirty or poisonous

energy that uses the power of the sun to produce electricity

... refers to resources or energy sources that can naturally replenish over time, making them sustainable

to burst with noise and force

the grey powder left after you burn something

If a volcano ..., it suddenly throws out smoke, fire, and melted rocks.

the gradual warming of the Earth's surface caused by an increase in pollution and gases in the air

serious problems that are being caused or likely to be caused by changes in the world's weather, in particular the world getting warmer as a result of human activity increasing the level of carbon dioxide in the atmosphere