Most people in three African countries have an optimistic outlook despite continuing anger at corruption and economic woes, a survey has found. South Africans, Nigerians and Kenyans all say healthcare and education will be better for the next generation.

In a few weeks, world leaders will gather in Paris to negotiate a climate change agreement that will frame the global agenda on this issue for the next decade and beyond. As a new Pew Research Center survey illustrates, there is a global consensus that climate change is a significant challenge.