Unit 3 Climate Change - virtual class for 12/12

Read through slides 28 - 37 to complete this section. Positive Feedback (Negative for the Environment, increasing temperatures)Some scientists believe the impacts of global warming may be greatest in tundra environments. There are regions of seasonal ice cover at the edges of otherwise permanent glaciers and ice sheets.Melting polar ice caps results in less ice and lowers planetary albedo.Lowering albedo increases the amount of solar energy absorbed at the Earth’s surface and leads to an increase in temperature.Rotting vegetation trapped under permafrost in the tundra releases methane that is unable to escape because of the ice covering. Increased thawing of permafrost will lead to an increase in methane levels as the gas escapes. Why the Arctic is climate change's canary in the coal mine - William Chapman Watch the video and answer the question below. Explain a feedback loop that affects the arctic. Read through slides 28 - 37 to complete this fill in the blank section. Negative Feedback (Positive Consequences for the environment - lowering temperatures )Increased evaporation in low latitudes, as a result of higher levels of precipitation, may lead to increased snowfall on the polar ice caps, reducing the mean global temperature.An increase in carbon dioxide in the atmosphere leads to increased plant growth by allowing higher levels of photosynthesis. Increased plant biomass and productivity could reduce atmospheric concentrations of carbon dioxide.Other mechanisms of negative feedback include:Burning: leads to more aerosols in the atmosphere and reflectivity, and thus reduced solar radiation at the surface, thereby causing cooling.Increased evaporation, increasing cooling. Draw a feedback loop - either negative or positive. Draw either negative or positive feedback loop. Must tell me which feedback loop you are drawing and explain the steps on the drawing. Why can sulfur be a good thing and where does it come from?