how about 70 present of global Ccarbon founded
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The global carbon cycle refers to the exchanges of carbon within and between four major reservoirs: the atmosphere, the oceans, land, and fossil fuels. Carbon may be transferred from one reservoir to another in seconds (e.g., the fixation of atmospheric CO2 into sugar through photosynthesis) or over millennia (e.g., the accumulation of fossil carbon (coal, oil, gas) through deposition and diagenesis of organic matter). This chapter emphasizes the exchanges that are important over years to decades and includes those occurring over the scale of months to a few centuries. The focus will be on the years 1980–2000 but our considerations will broadly include the years ∼1850–2100. Chapter 8.09, deals with longer-term processes that involve rates of carbon exchange that are small on an annual timescale (weathering, vulcanism, sedimentation, and diagenesis).
Answer:Cities are places of great efficiency, innovation, and -- especially in dense cities -- energy savings. But cities shouldn't let all that get to their head. According to a new UN report, cities around the world are not doing enough in the fight against climate change.
The report, "Hot Cities: battle-ground for climate change" from the United Nations Human Settlement Program, or UN-HABITAT, shows that while the world's cities only cover 2 percent of global land area, they account for a staggering 70 percent of greenhouse-gas emissions.
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