Climate change is now the most unpredictable threat to our planet. The climate of the earth has changed over the last century. There is stronger evidence that most of the warming observed the last 50 years is due to human activities. Because of gas emissions, temperatures should continue to rise over the 21st century. Its impact will be severely negative on both mankind and nature. Human activities that contribute to climate change include in particular the burning of fossil fuels, agriculture and land-use changes like deforestation. These cause emissions of carbon dioxide [co2] , the main gas responsible for climate change . And for this possibly many catastrophic changes will be inevitable. The more the greenhouse gases are emitted, the higher the tendency will be for the earth to warm. It will widespread the melting of snow and ice. Serious consequences will be a rise in sea levels, which will endanger coastal areas and small islands. Therefore, only reducing emissions of greenhouse gases should reduce the risk of the adverse effects. So, the whole world needs to be concerned to remove this fatal threat.