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Download Aim: SWBAT explain how feedback loops may contribute to climate
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Transcript
Please Do Now: 1) What is he only form of Nitrogen that plants can assimilate? 2)What happens in the process of Nitrification? Agenda Do Now Video Clip Feedback loops Video Clip Is it global warming or global climate change? Should really be referred to as climate change The results of the CO2 caused greenhouse effect are much more complex than simple warming Precipitation patterns are changing, many places are getting much hotter, some are getting wetter, most are getting drier, some are even getting colder What is a feedback loop? A cause and effect loop that cycles around repeatedly Ex: Someone gains weight, making it harder for them to exercise. They exercise less, so they gain more weight, making it even harder for them to exercise. Repeat. How are feedback loops related to climate change? If the feedback loops that effect the climate are positive, we would expect that as the earth gets warmer, the rate at which it heats up will increase. Are there positive feedback loops that affect the climate? Yes, a number of them Example 1: Ice caps; ice reflects a lot of the sunlight that hits it. The less snow there is, the less sunlight is reflected into space, increasing the warming Are there positive feedback loops that affect the climate? Example 2: Water vapor, as the earth heats up, more water vapor goes into the atmosphere. H20 vapor is a greenhouse gas, which increases warming. Repeat. Are there positive feedback loops that affect the climate? Example 3: Fires; as global temperature increases, wildfires become more carbon. These fires release more CO2, increasing the rate of warming. Repeat.
