Why is the world warming up? Let's think of Earth for just a moment as a greenhouse. Every second, a huge amount of energy smashes into our greenhouse. Our atmosphere, the glass roof and walls, reflects some of that energy, but most of it passes right through and heats everything up. Much of that heat used to escape back into space, keeping us at a stable, warm temperature.
Zašto se Zemlja zagreva? Zamislimo Zemlju kao staklenik na trenutak. Svake sekunde mnoštvo energije ulazi u naš staklenik. Naša atmosfera, stakleni plafon i zidovi, odbijaju deo te energije, ali većina prolazi i tako zagreva sve. Nekada se značajan deo te energije vraćao u svemir, održavajući stabilnu, toplu temperaturu.
But then something changed. Humans began to spew enough carbon dioxide to fill billions of greenhouses each day. What does all that greenhouse gas do? It makes the glass of our greenhouse thicker. Thicker glass means heat escapes into space much more slowly. And don't forget, energy from the sun is still streaming in just as quickly as before.
Međutim, nešto se promenilo. Ljudi su počeli da proizvode dovoljno ugljen-dioksida za milijarde staklenika. Šta čine ti gasovi staklene bašte? Čine staklo našeg staklenika debljim. Deblje staklo znači da toplota mnogo sporije dopire do svemira. Ne zaboravimo da sunčeva energija i dalje istom brzinom ulazi kao pre.
The result is a planet with temperatures too hot for our liking and, eventually... living.
Posledica ovog je planeta sa previsokom temperaturom za nas i, na kraju... previsokom za život.
[Countdown Take action on climate change at Countdown.ted.com]
[Odbrojavanje Pomozi da ublažimo klimatske promene na Countdown.ted.com]