Global Witness study latest to predict oil supplies could peak as early as 2015
Proposed levies could generate $12.4bn in annual tax revenues
Green groups launch legal challenge against Treasury's decision to wave through RBS investment in fossil fuel industries
New liquid-to-gas fuel promises to improve air quality and could help curb carbon emissions
New report warns there is a "significant risk" oil supplies will peak before 2020 - and the government is unprepared for the fallout
The phasing out of counter productive and outdated fossil fuel subsidies promises to deliver deep cuts in carbon emissions and revitalise international climate change negotiations
But renewable energy funding needs to double to $500bn annually to limit global warming, UN study warns
Unlikely partnership will see 29MW solar thermal plant installed at Californian oil field
Shell and BP distance themselves from lobby groups' "fake rallies"
Official warns that nation is in danger of energy shortage without greater uptake of renewables