Practical Winery
65 Mitchell Blvd, San Rafael, CA 94903
phone: 415-453-9700 ext 102
email: Office@practicalwinery.com
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March/April 2008
GRAPEGROWING
Water vapor is also a greenhouse gas, but its concentration in the atmosphere is not subject to direct human influence. The amount of water vapor in the atmosphere is controlled by the temperature, because the capacity to hold water vapor increases with rising temperature. Thus, water vapor acts as an amplifier, boosting the warming effects of other greenhouse gases.
HOW DO WE KNOW THAT CLIMATE CHANGE IS REALLY HAPPENING?
Imagine getting your winery's Board of Directors or management team to read a document summarizing the highly technical and complex details of your operations, and their significance to your bottom line. Now imagine them going through an explicit and lengthy process to agree to EVERY SINGLE WORD in the document. This is the process used by the panel convened by the world's governments to assess knowledge about climate change (the Intergovernmental Panel
on Climate Change, or IPCC; www.ipcc.ch/) about once every six years.
The cumulative contributions of this international team of expert scientists, including four major assessments andmany special reports, earned them a share of the Nobel Peace Prize in 2007. IPCC scientists read and interpret the vast published literature on climate change and write a comprehensive, balanced portrayal of the current scientific understanding.
Figure IV. Projected warming in global annual average temperatures from multiple climate models for a range of scenarios of emissions of greenhouse gases. Yellow line represents a case where no further greenhouse gases were added to the atmosphere. Gray bars to the right represent the range of 66% probability, with solid lines within each bar representing the IPCC "best estimate." Colored shading represents ±1 standard deviation.
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