
An assessment report to be released this week by the United Nations Environment Program and the World Meteorological Organization shows that reducing emissions of two common air pollutants — black carbon and gases integral to the production of ground-level ozone — could slow the rate of climate change markedly over the next half-century.
For decades, scientists have known that both substances harm human health. More recently, evidence has emerged showing the particles also affect our climate, yet the magnitude of the impact has remained uncertain. Some studies have suggested reducing the pollutants could have a major and immediate climate impact, while others have shown the impact of such reductions would be minimal.
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