Today, a serious problem that the earth and all species are suffering from is global warming, accompanied by natural disasters, erratic floods, sea level rise, arid land ... The reason is that humans impact on the earth, disrupt ecological balance, disrupt the greenhouse effect, which previously, thanks to that effect, was balanced that humans existed.

Greenhouse gases are gases capable of absorbing long-wave (infrared) radiation reflected from the earth's surface when illuminated with sunlight, then scattering heat back to the earth, causing greenhouse effect. Greenhouse gases, mainly carbon dioxide (CO2), methane and water vapor, help keep the heat emitted from the sun falling onto the earth and serve as a plastic curtain around the earth, with temperature relatively stable for all viable species. But with the use of more and more fossil fuels (coal, oil, gas ...) and the destruction of forests, people are releasing more CO2 and other gases into the atmosphere, beyond what is needed, they absorbs heat from sunlight, reflects and dissipates it, making the earth's temperature increase.