o they compare to those noted in proxy records of the last several hundred thousand years? How do present GHG concentrations compare to those at
Please discuss anthropogenic variations in atmospheric greenhouse gas (GHG) concentrations. How do they compare to those noted in proxy records of the last several hundred thousand years? How do present GHG concentrations compare to those at the beginning of the 19th Century? How have GHG concentrations varied globally over the last 150 years? What are current levels, and how rapidly are GHG concentrations changing? What are the top four, primary contributors to anthropogenic GHG concentrations, and what portion of overall increases in GHG concentrations does each primary contributor account for? How do we know that observed increases in GHG concentrations are from ancient carbon (aka fossil fuels)?
Trending now
This is a popular solution!
Step by step
Solved in 2 steps
