in the next few decades will
determine how much the
planet's temperature will
rise. While we are not
exactly sure how fast or
how much the Earth's
average temperature will
rise, what we know is:
If people keep adding
greenhouse gases into the
atmosphere at the current
speed; the average
temperature around the
world could increase by
about 4 to 12°F by the year
2100.
If we make big changes,
like using more renewable
resources instead of
fossil fuels, the increase
will be less about 2 to
5°F.