World governments should focus on rapidly driving down the costs of clean energy, Hart says.
About a third of the emissions reductions needed to get to net zero are expected to come from technologies that are not currently on the market, he says.
Hart: The United States' most important contribution to reducing emissions globally will depend ultimately on whether its world-leading capabilities in technology, innovation, and entrepreneurship are oriented toward climate solutions.
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Senay Ataselim-Yilmaz, Chief Operating Officer, Turkish Philanthropy Funds, writes that philanthropy often solves the very problems that stems from market failure. Some social issues, however, cannot be tackled by questioning the return on investment.