Why Earth lit by faint young Sun 3.8 bn yrs ago was not frozen

During the Archean eon, about 3.8 billion years - 2.5 billion years ago, the Sun was about 20 to 25 percent fainter, and with less sunlight, the oceans may have frozen on Earth.

India must develop own climate model: US expert

India is amongst the countries most vulnerable to climate change and must develop its own model to study changes at the regional level and take necessary mitigation measures, a senior US scientist of Indian origin said.