Riyadh is planting 7.5m trees and running a new metro against an Expo 2030 deadline. A look at the water, heat and money behind the desert city's greening
1. Historical Baseline
Pre-1750 Wilderness Extent
North America contained 3.9 billion acres of wilderness when Europeans first arrived—98% of the continent's land area.¹ From Arctic tundra...
1. Historical Baseline
Pre-1750 Wilderness Extent
The brown bear watched from the forest edge as Peter the Great's surveyors marked trees for his new capital. In...
1. Historical Baseline
Pre-1750 Wilderness Extent
The Arabian oryx paused at the crest of a sand dune, its white coat reflecting the scorching sun that would...