
A mother holds her child in Mwea Village, Kenya. "Women are so busy meeting basic needs that they can't invest in the future by doing paid work, going to school, or visiting the doctor regularly," Bill and Melinda Gates say in a recent CNN op-ed.

Women cook by an open flame in a slum near Nairobi, Kenya. "Without access to energy, the poor are stuck in the dark, denied all of the economic, social and health benefits that come with power," say the Gateses.

Smoke billows in the industrial province of Hebei, China. "We're betting that within 15 years, scientists and engineers will develop big breakthroughs that will put us on a path to zero carbon emissions," the Gateses say.

Maasai women carry water near the border of Kenya and Tanzania. "Women spend an average of four-and-a-half hours doing unpaid work every day, compared to an average of about two hours per day for men," say Bill and Melinda Gates.

A girl fills a can with water from a hand pump in a slum area of Lahore, Pakistan. "More than 1 billion people without energy spend a significant portion of their time collecting wood and water for the basics of life," according to the Gateses.

A farmer winnows rice in the Maharajganj district of India. In poor areas of the world, "many women's lives consist of six or seven or more hours of unpaid work every day," say Bill and Melinda Gates.