Reducing CO2 would reduce the abundance of air pollutants as well, because a major part of these are co-emitted by the same sources, like coal-fired power plants. Reduced air pollution leads to lower health hazards and lower damage to ecosystems and agriculture. From a different angle, the ‘co-benefits’ of reducing air pollution by reducing CO2 emissions can be an important element of climate policy, making these policies effectively cheaper, by removing the need for policies and technologies to filter out air pollutants. Other co-benefits are also subject to active research, like reduced dependence on fossil-fuel imports as a result of strategies to move away from fossil-fuel use in a transition to higher reliance on renewable energy technology.