President Barack Obama on Friday said the United States has a “moral imperative” to lead the fight against hunger and malnutrition in Africa despite shrinking national budgets around the world.

Washington India's population aged 50 and over is expected to double by 2050 when nearly one-third of its total population would fall in this age group, according to a US census.

As per 2010 census, 19,18,53,000 people in India were of 50 years and above, which made about 16.4 per cent of the total population. According to the US Census Bureau, this is projected to increase to 20 per cent (26,49,13,000) in 2020 and 24.3 per cent (35,55,96,000) in 2030; 28.5 per cent (44,82,23,000) in 2040 and 32.6 per cent (54,04,24,000) in 2050.

Ahead of the World Bank's Spring Meetings here this week, government ministers from almost 40 developing countries are meeting with UNICEF Executive Director Anthony Lake, UK International Development Secretary of State Andrew Mitchell, Chair of the United Nations Secretary General's Advisory Board on Water and Sanitation HRH the Prince of Orange, and major donors and water and sanitation sector organizations, to discuss speeding up global access to water and sanitation.

Year after year, the world’s nations gather to find ways to reduce carbon dioxide, the main greenhouse gas, with little meaningful progress. Frustrated by this slow pace, the United States and five other countries announced this week a modest but potentially game-changing initiative to cut three other pollutants that also contribute significantly to climate change.

Faulting the world for not doing enough to curb climate change, the United States on Thursday announced the formation of a six-nation coalition including Bangladesh to cut short-lived pollutants that speed up warming and harm health.

Secretary of State Hillary Clinton said the coalition of the US, Bangladesh, Canada, Mexico, Sweden and Ghana will launch a global drive to curb black carbon (soot), methane and hydrofluorocarbons (HFCs).

The U.S. has roped in Bangladesh and four other nations under a new six-country global initiative to combat climate change, protect health, improve agricultural productivity and strengthen energy security.

Announcing the ‘Climate and Clean Air Coalition’ here, Secretary of State Hillary Clinton said the world has not done enough to fight climate change and the coalition of the United States, Bangladesh, Canada, Mexico, Sweden and Ghana will work to curb black carbon, methane and hydro-fluorocarbons (HFCs).

The United States said on Thursday it will contribute $12 million to a six-country initiative to fight against climate change by low-cost programs, such as promoting clean cooking stoves.

Announcing the initiative, Secretary of State Hillary Clinton acknowledged the plan does not address carbon dioxide emissions, the primary cause of global warming that many governments are reluctant to cap.