Energy & Green Tech
Walk around New York and you'll likely hear the chugging of gasoline generators powering the city's tens of thousands of food carts. But not William Arevalo's.
Jul 25, 2026
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Engineering
Solar cells, devices that can convert sunlight into electricity, are now widely used in many countries, where they are helping to reduce reliance on electricity generated from fossil fuels. While most solar cells used today ...
Energy & Green Tech
South Africa, which produces about 40% of Africa's carbon emissions, is moving away from coal-fired power toward renewable energy such as solar and wind.
Jul 25, 2026
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