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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 rise of nations such as South Korea, Singapore and China as global economic players illustrated the importance of expanding and deepening human competence. A key starting point in the growth process is recognising that building engineering capabilities offered the best opportunity for technological leapfrogging and catch-up in a variety of industries."

"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."

Africa is yet to adopt full scale technology-led development. Steve Mbogo spoke to the Director of the Belfer Center's Science, Technology, and Globalisation Project and professor at Harvard University Calestous Juma on the opportunities that await the continent as a late comer.

"The Rio+20 process is an important reminder of the urgency to guide global production and consumption patterns with sustainability principles. Sadly, there is really no genuine global institution that is championing sustainable development. The vision that inspired Rio has been supplanted by two extreme positions. The first is a group that believes economic growth will have trickle-down benefits for the environment. The environmental camp has successfully replaced the spirit of Rio with a one-sided agenda that leaves little room for recognising the central role that human wellbeing plays in natural resource management."

If African countries can't plant genetically modified crops to produce more and healthier food, vulnerable populations will be at risk, argues Calestous Juma.

"African governments have a unique opportunity to turn the climate crisis into an opportunity. The starting point is for them to start creating domestic markets in clean technologies, many of which are now widely available. They need to define themselves as leaders in "green innovation" since they have not committed themselves too excessively to polluting technologies. They should be vigilant against import of polluting technologies. It is a chance for them to build a new image around their moral standing of being the lowest polluters."

China's Ministry of Science and Technology launched the China-Africa Science and Technology Partnership on November 24, 2009.  The ministry announced that technological cooperation will be enhanced in areas such as water management and conservation, sanitation, crop breeding, health, and renewable energy. One hundred joint research partnerships will be created, and 100 African scientists at the postdoctoral level will have the opportunity to conduct research at China's technology parks, research institutes, and private enterprises. Chinese scientists and engineers will also travel to African countries to provide technical guidance, and in order to increase the research capacities of African countries, China will also donate laboratory equipment.

Science, Technology, and Globalization Project Director Calestous Juma shared his insights into the history and future of Sino-African relations in a February 2008 interview with that's China columnist Jing Zhang.