Greenhouse gases are not always a bad thing. If the Earth did not have the greenhouse effect within its environment, life would not be sustainable because the temperature would only be around zero degrees on average. The greenhouse effect balances the temperature and allows for life to flourish. However, if there are too many greenhouse gases released into the atmosphere, then temperatures can rise to uninhabitable levels. With the increase of fossil fuel usage by the planet, the Earth's climate has begun to heat up. Global warming is real and climate scientists are adamant that we need to change our ways as a collective planet to help our chances of survival for future generations. The worst greenhouse gas there is comes from humans and factories alike. Carbon dioxide is the most harmful and heats up our earth the fastest.
This visualization from solarpower.guide shows the top 50 companies responsible for the most destruction to our ozone layer.