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.
(AP) -- California officials say they've found a way to pay for building the twin tunnels that would send water around the Sacramento-San Joaquin Delta.
The City of Sacramento is moving closer to meeting a mandate for water meters at the city's 136,000 residences.
A coalition of California environmental, labor and business groups, and local government officials launched a campaign Thursday to fight an effort to overturn the statewide ban on single-use plastic grocery bags.
Critics claim the Nestlé water bottling plant is draining Sacramento's water supply and marking it up for profit at a time when the on-going drought is reducing supply.
UC Davis researchers have identified 'high priority' dams in California where releasing water may be a key for the survival of native fish species.