So was the UN climate science panel's 2007 assessment of the reductions in carbon dioxide needed to have a 50% chance of containing global warming to 2C.
Last year Belgian researchers tested a shoebox-sized IVF laboratory built from cheap glass tubes that uses baking soda and citric acid to create the carbon dioxide needed for fertilisation to occur.
Reiterating that carbon dioxide need not be the only focus, an international team of scientists suggests 14 ways of controlling emissions of methane and soot, from cleaning up cookstoves to changing cultivation methods for rice paddies.
This applies even to rice because of the severe restrictions submergence imposes for the inward movement of oxygen and carbon dioxide needed for respiration and photosynthesis.
Six years ago, James Kasting, a planetary scientist at Penn State University, University Park, estimated that the amount of carbon dioxide needed to insulate Mars would create so much pressure that the gas would condense to a liquid and fall out of the clouds.
Carbon dioxide reforming needs higher temperatures (with the danger of coke formation); advantageously catalysts may be used (Ni on supports such as alumina or MgO).
The new report, dubbed the "1.5 Degree Report" says carbon dioxide use needs to fall by 45percentt by 2030 in order for us to reach net zero emissions by 2050.
