The Indian government is expected to back up its recent commitment to curb carbon emissions with a controversial move to levy a new tax on coal in order to pay for the roll out of renewable energy technologies. Speaking in his annual budget speech to the Indian parliament, finance minister Pranab Mukherjee said that a clean energy tax of 50 rupees ($1) a tonne will be leveled on all domestically produced or imported coal with the resulting revenue ring-fenced for use in a new national (…)