Why has Climate Change happened?

 Many scientists, 97 of 100 believe that climate change is caused  by the humans. We are producing more Greenhouse gases like carbón dioxide and methane that we used to do before. We are producing this gases with cars, burning fossil fuels, with factories.

The Greenhouse is making the Earth get hotter. The greenhouse layer is a natural layer that without it wouldn't live on the Earth because it would be too cold for the human species to live on the planet.
Solar radiation pases through the atmosphere the Earth absorbs some solar radiation and then reflect it back to the sapce but the greenhouse layer absorbs some of the radiation to heat the atmosphere. The problema is that us, the humans are producing more greenhouse gases and the greenhouse layer is getting thicker so the solar radiation doesn't scape to the space and the Earth is heating up.