As an Oxfam global ambassador Helena, 43, travelled to Peru, Nepal and Kenya to document the impact of climate change on people's lives and their ability to produce food.
Peru is already feeling the effects of changing climate, such as melting tropical glaciers in the Andes and high levels of solar radiation. Record rainfall in the Amazon basin this year has wrecked crops, spurring inflation and hurting specialty exports like coffee.
2010: BBC News - Amazon drought 'severe' in 2010, raising warming fears
Both droughts were associated with unusually warm seas in the Atlantic Ocean off the Brazilian coast.
"If that turns out to be driven by escalating greenhouse gas concentrations in the atmosphere, it could imply that we'll see more drought years in the near future," said Dr Lewis.
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