This is true for nearly every issue the Bill & Melinda Gates Foundation works on, from poverty reduction to primary-school enrolment. But nowhere is the contrast more stark or tragic than in health. Between 2000 and 2020 the world witnessed a global health boom.

Between now and 2050, 40 million more children will have stunted growth and 28 million more will suffer from wasting, the most extreme and irreversible forms of malnutrition, as a result of climate change, the Bill & Melinda Gates Foundation said in a report on Tuesday.

Malnutrition is the world's worst child health crisis and climate change will only make things more severe, according to Microsoft-co-founder turned philanthropist Bill Gates. Between now and 2050, 40 million more children will have stunted growth and 28 million more will suffer from wasting,