Tree Planting, Rock Weathering, Ocean Nutrition, Direct Air Capture, and Biomass with Carbon Capture - the pros and cons of sucking CO2 from the air. Why Negative Emissions Technology is useful for slowing Global Warming and offsetting hard-to-abate emissions, but will likely be limited to 10-30% of the solution.

Mirrors in space, manipulating clouds, or painting the Earth white to slow or halt global warming. Why solar radiation management techniques appear a cheap and quick fix, but don’t offer a complete solution to climate change and run a seriously high risk of going badly wrong.