A new study indicates that if current emission rates of greenhouse gases continue, leaves will begin to appear an average of 21 days earlier nationally by 2100 compared to recent trends. (climatecentral.org)
That is not much more than a decade's worth at current emissions rates. (e360.yale.edu)
To hold global warming in check requires reducing current emission levels by as much as 70 percent by 2050, compared with 2010 levels, and nearly eliminating such pollution by 2100. (scientificamerican.com)