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How would dumping fertilizers in the ocean help reduce carbon dioxide levles?
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Was the last ice age caused by global warming?
The last ice age is believed to have been triggered by the Milankovich cycles, which operate over the very long term and have great value as a theory to explain ice ages and long-term changes in the climate. Milankovich cycles can cause a very small reduction in average global temperatures over a period of centuries, but are considered too weak to be the only explanation of the ice ages. Scientists say that as the earth cooled slightly, as a result of a change in the Milankovich cycle, the level of atmospheric water vapour fell, resulting in a gradual further fall in temperatures. Eventually, carbon dioxide concentrations began to fall in tandem with falling water vapour levles, until an ice age was underway. After a period of thousands of years, the cycle was self-correcting. Ice covered much of the seas, while the remainder of the ocean was too cold to absorb much carbon dioxide. Rising carbon dioxide levels began to warm the world once again, leading to higher water vapour levels and eventually a return to normal temperatures. Milankovich cycles are considered unimportant for short term climate changes such as the present period of global warming.
Are sales of CFC and HCFC banned?
Most countries abide by the ban on chlorofluorocarbons. The few that do not are small and are not considered significant contributors. They may also (eventually) face economic sanctions for continued use of CFCs.Answer:There is no ban of all chlorinated hydrocarbons (HFCs and HCFCs). The control of CFCs and HCFCs was covered in an accord called the Montreal Protocol. It stated several things which were agreed to by signing countries:There are several compounds of chloro- and Bromo- fluorocarbons that must be controlled to prevent stratospheric ozone degradationThese substances will be controlled and eliminated on a timetableThe timetable is stepped and adjusted to meet the needs and abilities of countries to comply with it.For CFCss the 1991 to 1992 controls are based on the 1986 levles of use and productionFor CFCs in 1994 the consumption and production will be no more than 25% of 1986 valuesFor CFCs in 1996 the consumption and production will be no more than 0% of 1986 valuesRelated , but less active CFCs (Hydrochlorofluorocarbons, the HCFCs) will be phased out on their own schedule. This is due to vital uses of compounds like Halons in firefighting and refrigeration. The use of these compounds was to replace the more active HFCsHCHCs are also less active as Global Warming gasesHCFC phase out was initiated in 1996HCFCs will be phased out by 2030There are some uses of HCFCs where there are no viable alternatives. These include medical inhalers and submarine and aircraft fire fighting systems. HCFCs will be allowed to be used in these specific used without elimination
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