NIWA says greenhouse gas methane on the rise again

The concentration of methane in the atmosphere is rising, according to measurements made by NIWA.

NIWA has today released measurements from its globally significant Baring Head station showing that southern hemisphere atmospheric methane increased by 0.7% over the two-year period 2007

This is significant in that it follows a three-year period of no growth, and accounts for more than half of the growth observed over the ten years 1999