http://www.physorg.com/ en-us Physorg.com internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine. Large trees have declined in Yosemite National Park during the 20th century, and warmer climate conditions may play a role. http://www.physorg.com/news168094371.html Space & Earth Wed, 29 Jul 2009 13:58:29 EST news168094371 Human impact on tropical forest ecosystems has reached a "tsunami" stage, say scientists, and will require a new generation of sophisticated remote-sensing technology to monitor the changes. Speaking at a January 12, 2009 symposium "Will the Rainforests Survive? New Threats and Realities in the Tropical Extinction Crisis*," hosted by the Smithsonian Institution, Gregory Asner of the Carnegie Institution's Department of Global Ecology presents new estimates of the global human impact on rain forests, including not only deforestation but also the extent of selective logging and forest regeneration. http://www.physorg.com/news150990023.html Space & Earth Mon, 12 Jan 2009 13:40:23 EST news150990023