Protecting the vanishing wetlands. Saving wetlands / by Emily Sohn -- Looking at Lake Tanganyika. Less mixing can affect lake's ecosystem / by Emily Sohn -- Wildfire. Watching for wildfires in Yellowstone / by Emily Sohn -- Conserving energy at home. Cold house, hot house, green house / by Emily Sohn -- Global warming. A change in climate / by Emily Sohn -- Algae as early warning devices. Arctic algae show climate change / by Emily Sohn -- Migrating monarchs and global warming. Will climate change depose monarchs? / by Emily Sohn -- Saving the spotted owl. Spotty survival / by Kate Ramsayer -- Taking care of India's tigers. Missing tigers in India / by Emily Sohn -- Endangered elephants. Helping to save elephants / by Emily Sohn -- Dust in the wind. Sky dust keeps falling on your head / by Emily Sohn -- Damaging detergents. The down side of keeping clean / by Emily Sohn -- A tiny clean-up crew. Nanosponges soak up pollutants / by Emily Sohn -- Helpful bacteria. Toxic cleanups get a microbe boast / by Emily Sohn.