Global Warming

Global warming might seem like a botanical boon. After all, milder temperatures and more carbon dioxide and nitrogen should feed flora. But a ten year study has found that any [blank] positive effects on plant growth from climate change may soon disappear. The report is in the journal Nature Climate Change. Researchers transplanted vegetation from four grassland ecosystems to lower, warmer elevations. They also [blank] the precipitation at the transplant sites based on [blank] rainfall estimates. For the first year, the plants did great, producing more biomass and churning out more oxygen for us. But their productivity went down for the rest of the [blank] .