Due to our release, through factories and automobiles every year, of more than six billion tons of carbon dioxide, which helps air absorb heat from the sun, our atmosphere seems to be getting warmer. This is bad? Well, it's been calculated a few degrees' rise in the earth's temperature would melt the
Cada año, nuestras fábricas y automóviles producen y liberan más de seis billones de toneladas de dióxido de carbono que ayudan al aire a absorber calor del sol, nuestra atmósfera parece estar calentándose progresivamente. ¿Es malo ésto? Bueno, se ha calculado que el aumento de unos pocos grados