Countries in the Sahel region of Africa have made little progress on the "Great Green Wall," a 5,000-mile-long band of trees planned for the southern edge of the Sahara Desert. Even where countries ...

Its main aim was to prevent the Sahara Desert from advancing ... but aren't necessarily directly used for planting trees. Even if pledged funds could instantly show up in recipient countries' accounts ...

Planting trees is a net positive for the climate, but a new study shows tropical regions deliver the strongest cooling and carbon-capturing benefits.