"Ending extreme poverty in all its forms" is no longer a platitude or a dream for development experts – it's the guiding vision of the United Nations High Level Panel, as well as an achievement that's closer to being realized than ever before, thanks to the millennium development goals.

In recent years weather events have whiplashed between the extremes of heat and cold, flooding and drought. Carbon dioxide and other greenhouse gases—largely from the burning of coal, oil, and natural gas—have loaded up in the atmosphere, heating the planet and pushing humanity onto a climatic seesaw of weather irregularities. High-temperature records in many places are already being broken with startling frequency, and hotter temperatures are in store.

The energy game is rigged in favor of fossil fuels because we omit the environmental and health costs of burning coal, oil, and natural gas from their prices. Subsidies manipulate the game even further. According to conservative estimates from the Global Subsidies Initiative and the International Energy Agency (IEA), governments around the world spent more than $620 billion to subsidize fossil fuel energy in 2011: some $100 billion for production and $523 billion for consumption. This was 20 percent higher than in 2010, largely because of higher world oil prices.

Degradation of the natural world is undermining efforts to reduce poverty, warn scientists, who say the only chance of achieving global prosperity is for all countries to combine poverty and environmental targets.

World leaders should set six goals around universal clean energy, an end to water and food shortages, thriving lives and livelihoods, and healthy and productive ecosystems, they say.