In your opnion, why is it so hard to save the planet?

the Global Warning is an normal process taht occurs with the planet, however, mankind with emissions of gas (CO2, CH4 e N2O mainly) and the deforestation, accelerate that process, puting risk the survival in earth. Several agreements, about climate have already made, the more important The Kyoto Protocol. That has the objective to decrease the emissions of gas in more polluted countries, however, not all countries are willing to do sth to decrease its production because of greenhouse effect, making difficut to find a solution for a critical problem to ignored by developed countries.