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.
About 9 in 10 of the produce tested for pesticides at California grocery stores, farmer's markets and other outlets had little or no residue, according to the state Department of Pesticide Regulation's 2016 survey.
Gov. Brown attended the first UN Climate Conference held since President Donald Trump said he will withdraw from the Paris Climate Accord.
A year after California enacted a statewide ban on single-use plastic bags, environmental groups say early data show a significant dip in plastic trash.
A collection of environmental, fishing and whitewater groups recommends changes to dam management in a new report, issued in response to the failure of the main spillway at Lake Oroville in February.
Traditional methods to cool cows use 11,000 gallons of water per cow per year. UC Davis researchers are trying out new techniques that use less resources.