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  1. News • http://www.boston.com/news/nation/articles/2009/09/30/senate_climate_bill_tougher_now_than_houses_version/ • http://www.boston.com/news/nation/articles/2009/09/30/epa_seeks_to_limit_chemical_runoff_from_plane_deicing/

  2. Photosynthesis • 50% of primary productivity is on land; 50% in the ocean • 6 CO2 + 6 H20 (+ light, nutrients, Chlorophyll, trace elements, and enzymes)C6H1206 + 602 • Autotrophs vs. Heterotrophs • Chemosynthesis • H2S +CO2Corg + SO4 • http://www.divediscover.whoi.edu/vents/vent-video.html • http://www.divediscover.whoi.edu/biology/video.html

  3. Primary Productivity • Total Carbon fixed in gC/m2/day • GPP – respiration = net primary productivity • How can you measure net primary productivity? • How can you measure NPP? • Can measure by C14 uptake (HCO3-) • O2 production • nitrate uptake

  4. Image courtesy of NASA

  5. Factors that affect productivity • Light • Nutrients • Water • Species

  6. Aquatic Food Chain Image courtesy of teachnet-lab.org

  7. Terrestrial Food Chain