The science behind geo-engineering as, at best, uncertain. Geo-engineering, of course, is the attempt to manipulate the environment manually in an attempt to reduce or mitigate rising greenhouse gases.
Recently, a private geo-engineering project off Canada's west coast has been causing international concern. One hundred tonnes of iron sulphate has been dropped into the Pacific ocean -- in a so-called "ocean fertilization" scheme -- and now, some say, it's causing a big problem.
Jim Thomas is the research program manager for the ETC group
, an N-G-O that monitors the effects of geo-engineering projects. We reached Mr. Thomas in Montreal
Hear the other side, here