The greenhouse effect is a good thing. Greenhouse gases in our atmosphere trap heat, warm our atmosphere and keep our Earth at a comfortable 15 degrees. Extra greenhouse gases are released when we dig up and burn fossil fuels. We mostly do this to generate energy for industry, our homes and schools. Burning fuel to transport us and our stuff around the place creates more greenhouse gas. Deforestation, burping and farting cows are also large contributors. These gases put more energy into our atmosphere and are starting to affect our climate with more intense weather events and increased temperatures.