What's behind the Sahel's water revival?

For decades, the Sahel was synonymous with drought and desertification. But now, the region is seeing a surprising water revival. Since the 1990s, and especially over the past five years, rainfall has increased across much of the region. Rivers are flowing again. Water tables are rising. Lake Chad has also shown signs of recovery. What's driving this change? And could a wetter Sahel bring new risks as well as new opportunities? Climate Watch host Zhao Ying speaks with Richard Taylor, professor of groundwater and climate resilience at the University of Toronto.