Introduction

Human activities are increasing greenhouse gas (GHG) concentrations in the atmosphere. In 2000, the global increase in atmospheric CO2, the single most important anthropogenic GHG, originated mainly from the burning of fossil fuels, which contributed about 6.5 Pg C yr-1, and from deforestation, which contributed about 1.6 Pg C yr-1 (IPCC, 2001a). Globally, CO2 accounted for about 60% of the global warming potential. Other GHG contributing to global warming were CFCs (15%), CH4 (15%), and N2O (6%). These changes in GHG concentrations are expected to lead to a general rise in global temperature and a modification in weather patterns (IPCC, 2001b). In order to minimize the impact of climate variability and climate change on the terrestrial biosphere, over 170 countries ratified the agreement of the Kyoto Protocol in 1997. This protocol aims at stabilizing GHG in the atmosphere at a level that will reduce the dangers from anthropogenic interference

* Presented at the International Workshop on Reducing Vulnerability of Agriculture and Forestry to Climate Variability and Climate Change, Ljubljana, Slovenia, 7-9 October 2002.

with the climate system. The protocol will become legally binding when ratified by countries accounting for at least 55% of the total 1990 GHG emissions. Countries have committed to reduce their GHG emissions to varying extent. Meeting their respective goal will undoubtedly be difficult for many countries. Canada will need to reduce its annual GHG emissions to 571 Tg CO2 equivalent by 2008-2012, down from a projected level of 809 Tg under business-as-usual situation. Slowing the rate of increase of the concentration of these gases is expected to require efforts from many sectors of the economy. Agriculture is one of the sectors that could reduce the extent to which fossil fuel emissions need to be reduced by enhancing the C sink in agricultural soils. This paper focuses on the role of management practices in sequestering C in agricultural soils and, at the same time, mitigating GHG emissions. We present a global perspective, but examples are based on Canadian experience.

Guide to Alternative Fuels

Guide to Alternative Fuels

Your Alternative Fuel Solution for Saving Money, Reducing Oil Dependency, and Helping the Planet. Ethanol is an alternative to gasoline. The use of ethanol has been demonstrated to reduce greenhouse emissions slightly as compared to gasoline. Through this ebook, you are going to learn what you will need to know why choosing an alternative fuel may benefit you and your future.

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