Every time you switch on a light, turn on a TV, start up a car, energy is required. Most of the power that we consume - the power behind our fridges, cookers, heaters, coolers, washers, dryers, planes, trains and automobiles - comes from the combustion of fossil fuels.
Burning coal, gas and oil is the cheapest and easiest form of power but it has problems. Every time you burn a fossil fuel, it produces a gas called carbon dioxide.
This goes into the atmosphere and makes it more difficult for the excess heat on our planet (most of which comes from the sun) to escape back into space. Carbon dioxide acts a lot like the glass on a greenhouse, which is why it is called a greenhouse gas.
Read on to find out what the consequences of global warming could be and what are the main causes of greenhouse gas emissions.