It found that a tree’s growth rate increases with its size, in some cases adding the mass of a small tree every year.
That has huge implications for the amount of carbon dioxide an older tree can absorb.
“One of the analogies I use is if you’re managing a sports team, you’ve got to know who your star players are." says forest ecologist Nathan Stephenson with the USGS, and the study’s lead author.
"This would be the equivalent of discovering that your 90-year-old players are the stars of the team," he says.
The increase in the number of wildfires in California and the western U.S. may partly be caused by climate change.
The San Joaquin Valley enjoyed three weeks of healthy air in July for the first time in 20 years.
The California Fish and Game Commission voted Wednesday to ban bobcat trapping in the state.
President Barack Obama says it’s time for the US to get serious about climate change. But long-time observers say California law and policy makers have been enacting tough environmental laws for years.
Three workshops are scheduled in Truckee to give people a voice in developing a 'brand' for the town.