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Oslo, Norway, they have reduced energy consumption by 70 percent simply by using an innovative and energy-efficient form of streetlights without an international agreement. The African region of Okavango planted 300,000 acres of trees, which will sequester 30 million tons of carbon dioxide. The state of South Australia is on track to generate 33 percent of its power from renewable sources by the year 2020. Across its various regions, China is investing billions of dollars in electric and hybrid vehicles. South Africa is developing a solar project that, when complete, will provide one-eighth of all of the energy of the entire country. Twenty-nine of New York City's universities and hospitals have accepted Mayor Bloomberg's challenge to reduce their emissions by 30 percent within the next few years.

in California

orld's largest solar plant and the world's largest wind farm, providing enough energy to power 740,000 homes. We have already approved solar plants that will provide 4,000 megawatts of energy.

goal of generating 33 percent of our energy from renewables by the year 2020.

California is now 40 percent more energy efficient per capita than the rest of the United States. More than one-third of the world's clean-tech venture capital flows right here out of our state. We lead the nation in clean energy patents and clean energy businesses.

Solazyme

Civic Consulting Alliance, a nonprofit organization that builds pro bono teams of business experts. In this case, the alliance convinced consulting firms to donate $14 million worth of hours to projects like designing an electric car infrastructure and planning how to move the city toward zero waste.

The city’s 13,000 concrete alleyways were originally built without drainage and are a nightmare every time it rains. Storm water pours off the hard surfaces and routinely floods basements and renders low-lying roads and underpasses unusable.

Chicago spends over $10 million a year planting roughly 2,200 trees. From 1991 to 2008, the city added so many that officials estimate tree cover increased to 17.6 percent from 11 percent. The goal is to exceed 23 percent this decade.

It identified wind, solar and water as alternatives, as well as geothermal energy and so-called biomass energy from waste, as alternative power sources.