Global CO₂ emissions have surged 60% in 30 years, but activists worldwide pursue solutions — from cooling buildings and green power grids to planting 65,000 acacias in Sudan that store carbon and fight poverty.

Global CO₂ emissions have surged 60% in 30 years, but activists worldwide pursue solutions — from cooling buildings and green power grids to planting 65,000 acacias in Sudan that store carbon and fight poverty.