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There is a small brook at one end of Ms Johnson's smallholding.

He says the technology could improve the lives of the poorest farmers in the world: “70% to 80% of farmers are smallholding farms with two to three animals.”

He has found that current modeling of local smallholding forestation sites is not compatible with the internationally agreed Paris Agreement.

Tourism offered vital extra earnings for many, with few other work opportunities outside tilling the land on smallholdings.

On a sweltering afternoon in the small Kenyan village of Njoro Mata, a farmer is desperately inspecting the damage caused to her smallholding by elephants.