How much do trees vary in the way they suck carbon dioxide from the air and use it to make roots, trunks, branches and leaves? The answer to that question is an important one because it has a huge impact on our ability to predict how destroying or creating forests influences climate change. And the correct answer is a surprising one, according to two related studies published in the Proceedings of the National Academy of Sciences this week by University of Minnesota forest ecologist Peter Reich and colleagues in Minnesota, Arizona, Australia, China, Poland and Germany.
Conventional models used to assess the impact of forests on greenhouse gas concentrations in the atmosphere assume that the way trees use carbon to build roots, leaves and trunks is fairly constant across a range of conditions — that is, that trees everywhere devote the same fraction of new growth to each component and that components have the same durability everywhere. However, analyzing massive amounts of data gathered from around the globe, Reich and colleagues documented predictable differences in key properties of forests across north-south climate gradients. Continue reading
Environmentalists in the United States have long pushed for reductions in carbon emissions. Now, it seems the era of carbon regulation may be upon us.
But implementing these complex regulations is complicated and takes place at both the federal and state levels. This was the topic of Fresh Energy science policy director J. Drake Hamilton’s Frontiers in the Environment lecture last Wednesday, April 30 on the University of Minnesota’s St. Paul campus.
In “Adventures on the Frontiers of Carbon Reduction,” Hamilton emphasized the need to educate the public on new and existing policies impacting carbon emissions for broader public involvement.
Outdoor air pollution from factories and automobiles seems to dominate the news. But there’s another, just as sinister, form of pollution and it’s coming from inside the house.
Ellison Carter, a postdoctoral fellow in energy, air pollution and health at the Institute on the Environment, discussed her research on environmental and health impacts of indoor air pollution at Frontiers in the Environment in February.
In her presentation, “Where There’s Smoke…Evaluating the Benefits of Household Energy Improvements in Developing Countries,” Carter explained why indoor air pollution in developing nations is a particularly challenging problem.