Hong Kong will have to ban all fossil fuel vehicles, switch off air conditioning and seek “very close energy regional cooperation” to achieve zero carbon emissions by 2050, according to a new paper set to engage the public in drafting a long-term strategy on the issue.But do not fret – the consultation also gives less stringent choices that will still reduce carbon emissions by 60 or 80 per cent from 2005 levels. Such reductions will mean annual carbon emissions per capita of 2 tonnes or 1…