We know that climate change is caused by greenhouse gases, but have you ever wondered where those come from? Man-made systems are to blame, some having a much larger impact than others. This article will explore the commonly cited 5 industries and systems that emit these gases and break down their contribution to global warming. For a refresher on the science behind climate change, check out the Climate Change 101 post here . Otherwise, keep reading to learn about the top 5 c