Explain climate change in the past 100 years

In the past 100 years the climate on the Earth has been constantly changing. The climate has been gradually warming up, and that has been affecting all of the planet. The sea levels are on the rise which puts some island nations on the verge of losing their land, the warming up is melting the ice sheets and changing the environment, the desertification process increases, the storms are becoming stronger and more dangerous, droughts become longer ...

The main reason for such a rapid change in the climate is attributed to the human activity because the humans have been constantly increasing the levels of the CO2 in the atmosphere in the past 100 years. The process has been going on naturally, but the humans have managed to accelerate it significantly and strengthening the Greenhouse effect more and more.