Changes absorbed in Earth climate since the early 20th century are primarily driven by human activities, particularly fossil fuels burning, which increase heat trapping greenhouse gases levels in Earth atmosphere, raising Earth average surface temperature. These humans produce temperature increases are commonly referred to as global warming. Natural process can also contribute to climate change, including internal variable. So we have to limit ourselves doing this because we are destroying our climate, we are destroying our environment and we don't know what it affect on us later