A new UN report, produced over the past five years by a team of 250 scientists and experts from more than 70 countries, shows that for climate change mitigation policies to be effective, they must address entire systems – such as energy, food and waste – rather than specific problems – such as water pollution. For example, a stable climate, clean air, and good health are interconnected outcomes. Therefore, despite the fact that climate mitigation measures to achieve the objectives of the Paris Agreement would cost around 22 trillion dollars , reducing air pollution would bring health benefits of 54 trillions of dollars.