The impact of aerosols on the environment

气候变化对加拿大人来说是一个重要的问题，因为它有可能极大地影响他们的生活质量。人们普遍认为，全球变暖主要可归因于温室气体和气溶胶引起的辐射强迫(传入太阳辐射和地球传出热辐射之间的热平衡发生变化)的变化。气溶胶通过散射和吸收太阳辐射直接影响全球气候，而通过改变云的性质(即其反射率和寿命)间接影响气候。然而，气溶胶对辐射强迫的影响程度是复杂和不确定的。2007年政府间气候变化专门委员会(气专委)的报告显示，总的净人为辐射强迫的不确定性主要是气溶胶辐射强迫的不确定性。重要的是要量化气溶胶的来源，了解气溶胶在气候变化中的作用，这样才能减少强迫估计的不确定性。这一进展是必要的，这样才能制定适当的气候政策，开发和改进排放控制技术。

Climate change is an important issue for Canadians as it has the potential to drastically affect their quality of life. It is generally accepted that global warming can mostly be attributed to changes in the radiative forcing (changes to the heat balance between incoming solar radiation and Earth's outgoing thermal radiation) due to greenhouse gases and aerosols. Aerosols directly affect global climate by scattering and absorbing solar radiation, while they indirectly affect climate by changing the properties of clouds (i.e., their reflectivity and lifetime). However, the magnitude of the effect of aerosols on radiative forcing is complex and uncertain. The 2007 Intergovernmental Panel on Climate Change (IPCC) report shows that the uncertainty in the total net anthropogenic radiative forcing is dominated by the uncertainty in the aerosol radiative forcing. It is important that the sources of aerosols are quantified and that the role of aerosols in climate change is understood so that the uncertainty in the forcing estimates can be reduced. This progress is necessary so that appropriate climate policies can be made and that emission control technologies can be developed and improved.