Climate change refers to a change in average weather conditions, or in the time variation of weather within the context of longer-term average conditions. Climate change is caused by factors such as biotic processes, variations in solar radiation received by Earth, plate tectonics, and volcanic eruptions. Certain human activities have been identified as primary causes of ongoing climate change, often referred to as global warming. Climate change is not a new topic. The Earth's climate has changed throughout history. Just in the last 6.5 lakh years there have been seven cycles of glacial advance and retreat, with the end of the last ice age about 7,000 years ago marking the beginning of the modern climate era — and of human civilization. Most of these climate changes are because of even a very small variation in Earth’s orbit that change the amount of solar energy our planet receives and the result is big which is climate change. Despite the growing use of renewable energy, more than 80% of the world’s energy still comes from burning fossil fuels and we analyse the current situation, it will continue to do so for many decades to come. It means we simply won’t be able to replace it with renewable energy fast enough. At the same time, under the Paris climate agreement, the world needs to cut emissions fast, in order to reach net-zero emissions by about 2060.