March 2015 was the warmest March in 136 years of records, and CO2 levels are now higher than they have been in 800,000 years. This is not exaggerating. Our Earth is getting hotter.

Global warming isa relatively large change of Earth’s temperature in a short time, specifically, 0.4°C in one century. In our century, our planet has increased by 0.8°C in one century, which is definitely in a state of global warming.

Do humans contribute to global heating?
Absolutely yes. Humans contribute to heating. CO2 absorbs heat that could otherwise be reflected back to the atmosphere. We produce excessive CO2and other greenhouse gases, at the same timecutting down many trees that can absorb carbon. As a result, we destroyed the “energy in, energy out” balance and the relatively stable temperature of our Earth.

Human carbon emissions. We burnfossil fuels and we change forests to cemented land. The volume of these activities was about 1 billion tons / year a century ago, butit’s now about 10 billions tons / year. Carbon emissions are dominated by China, the US, Europe, and now India. The primary sources are coal, oil, gas, and cement manufacturing. Meanwhile, carbon uptake by plant life is reduced through deforestation and ocean acidification.

Global warming is not only a theory. NASA, the UN, andscientific agencies around the world have observed the effects of global warming. Increasing temperature is among one of the effects. There are other chain effects that follow. The ice is melting under the hotter climate, which causes the rise of sea level. Artic animals are losing their home, and the rising sea will consequently flood the coastline cities. The consequences are just on the endless list.

Our Future
Denialists of global warming may well cite that Earth has experienced several times of warming in its history and the planet happened to survive each time. So will it now. However, thepre-history Earth’s changing climate was caused and restored by the force of nature. Today, we heat up the land ourselves. And obviously if we don’t act now, we will not have the force and time to recover the Earth this time.