Scientists say planting trees in the tropics is a viable method to offset carbon emissions:
A new study, which used computer modeling to calculate the impact of forests on climate change, concludes that yes, trees can help... if they're planted in the right places. According to a BBC article,
Dr [Govindasamy] Bala [of Lawrence Livermore National Laboratory] and colleague Ken Caldeira, from the Carnegie Institution of Washington, used a computer model to determine the impact which forests in different parts of the planet would have on temperature.
Their analysis indicates that three key factors are involved..