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Colleagues said he tweeted more than any professor they knew, and Calestous Juma’s tweets covered a swarm of things. Income inequality, and a free-trade area for Africa, you might expect. Those were the subjects he taught at Harvard: getting poorer countries, especially in Africa, to grow and thrive was the obsession of his life. But he also tweeted about a wheelchair that could climb stairs, the increasing size of steaks, and the maximum number of goats seen eating up in a tree. He was extra-delighted to send out a New York Times editorial, from 1878, about Thomas Edison’s new “aerophone”: “Something ought to be done about Mr Edison, and there is a growing conviction that it had better be done with a hemp rope.”

Calestous Juma, a prominent global advocate for sustainable development in struggling countries, particularly in his native Africa, could trace his passion for technological innovation to his arduous childhood in colonial Kenya.

A professor of the practice of international development, and a writer of great range, Calestous Juma promoted technology for the poor and vulnerable throughout the world. He also wrote a book explaining why people are wary of innovation, and delighted his more than 100,000 Twitter followers by retweeting cartoons that ribbed those who are resistant to science.

"The goal of the book was to invest in thinking. It doesn't have a list of recommendations but generates options for action that are backed by evidence. We chose to forgo credit by adopting this approach, but it’s been very encouraging to see some key impacts that acknowledge the book."

"Africa's economic diplomacy will be dramatically shaped by the Continental Free Trade Area (CFTA) negotiations that will conclude in 2017. This builds on the Tripartite Free Trade Area covering 26 countries with 650 million people and a GDP of US$1.5 trillion. The CFTA will comprise a billion people with an initial GDP of $3 trillion. The foundations of the agreement include free trade, infrastructure development and industrialisation. This is a grand opportunity that will shape Africa's relationships with the UK, Europe and the rest of the world."

Many energy consumers, and even analysts and policymakers, confront and frame energy and climate risks in a moral vacuum, rarely incorporating broader social justice concerns. Here, to remedy this gap, we investigate how concepts from justice and ethics can inform energy decision-making by reframing five energy problems — nuclear waste, involuntary resettlement, energy pollution, energy poverty and climate change — as pressing justice concerns.

"To harness the globally available technologies, African leaders will need to take into account the multisectoral dimension of African agriculture and pay particular attention to the urgency of investing in rural infrastructure, higher agricultural training and creation of regional markets."

"In an email interview with Global Ideas, [Calestous] Juma touches on the challenges and opportunities raised by climate change in Africa, the economic drivers behind a rash of innovations, the role of African universities and why dogma is holding back the continent's full research potential."