You're listening to a podcast from the BBC World Service. This is Hard Talk with me, Stephen Sacker.

Thanks for downloading this edition of the program. I do hope you enjoy it.

I'm on the road in Zimbabwe to witness the effects of change in Southern Africa's climate.

Zimbabwe in the post-Mugabe era is wrestling with an economic crisis,

endemic corruption and widespread poverty, which leaves Zimbabweans extremely vulnerable in the face of

prolonged drought. Crops have failed. Hydro power is down. The taps have run dry. Also at risk is Zimbabwe's

wildlife population. Animals and people are now in a desperate competition for resources.

I began my journey at Victoria Falls, one of the wonders of the natural world, where the waters

of the Zambezi River plunge more than

a hundred meters down a ravine that divides Zimbabwe from Zambia.

Long before David Livingston got here and named this spectacular place, Victoria Falls, local people knew it as the smoke that thunders.

But right now, this smoky mist isn't so thick, and the thundering roar, well, it isn't so loud.

Hi.

Elisha Moyo is the Zimbabwean government's leading climate change researcher.

He is constantly monitoring the falls.

Of course, the falls are seasonal, but something is happening, it seems, which goes beyond seasonal chain.

Yes, you'll find that the Victoria Falls,

the blanger water, although it is seasonal,

where it peaks around March from January to around March, May,

where you have the peak amount of water falling through the falls.

You find out that during the past recent years,

there's been a change in the amount of water that falls passed through the Victoria Falls.

...