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The most extensive and detailed study to date of 130 North American tree species concludes that expected climate change this century could shift their ranges northward by hundreds of kilometers and shrink the ranges by more than half.

Climate change inescapable fact Story by NGOVI KITAU Publication Date: 6/9/2008 CLIMATE CHANGE LEADING to global warming is the biggest environmental challenge facing the world. The World Environment Day was marked last week, and it is necessary to examine the state of our environment. Our moderate weather and tropical climate encourage a range of outdoor activities. We have been fortunate to live in a country that has marvellous mountains to climb, fabulous beaches to bask in, magnificent vegetation and animals in our famous national parks. We have great lakes and rivers to explore, fertile highlands to grow cash crops and rear exotic dairy animals in, extraordinary lowlands to grow food crops in, the magnificent Rift Valley, beautiful plateaus and hills covered by dense tropical forests and giant trees, and great savannas for grazing our animals in. And what do we observe today? Long and recurrent droughts, flooding whenever it rains, melting of ice on Mt Kenya, destruction of the Mau and other forests, continuing and alarming soil erosion, silting of dams, degradation of the eco-system, accelerated desert march, loss of biodiversity, and persistent human conflict over scarce resources.

September 23 this year marks an unfortunate milestone: the day humanity will have used all the resources nature will generate this year, according to Global Footprint Network data. Earth Overshoot Day marks the day when humanity beings living beyond its ecological means. Beyond that day, we move into the ecological equivalent of deficit spending, utilizing resources at a rate faster than what the planet can regenerate in a calendar year. Globally, we now now require the equivalent of 1.4 planets to support our lifestyles. But of course, we only have one Earth. The result is that our supply of natural resources -- like trees and fish -- continues to shrink, while our waste, primarily carbon dioxide, accumulates.

This study is the first to show directly the impact of climate change on a mountainous ecosystem by physically studying the location of plants, and it shows what could occur globally if the Earth's temperature continues to rise. The finding also has implications for forest management, as it rules out air pollution and fire suppression as main causes of plant death.

Polly's Tree by Sylvia Plath

June 6, 2008-Satellite images show Papua New Guinea's Gulf Province rain forest intact in 1988 (left) and laid bare by logging in 2002. The images were released this week as part of a new study.

Some "O Ambassador" projects include: * Building a package of school supplies for a classroom in need * Planting a tree on school grounds * Creating "AIDS Awareness" posters * Organizing "Read-A-Thons" * Collecting old blankets and sleeping bags for local homeless shelters