Asia-Pacific governments have for years felt the heat for being laggards on climate action, but as 2020 winds down – all things considered, amid the turmoil of Covid-19 – the region is entering the new year having sent strong signals about addressing emissions and embracing renewable energy.Central to the buoyant year-end mood is the pledge in October by the triumvirate of major regional carbon-dioxide emitters – China, South Korea and Japan – to achieve “net zero” carbon emissions by the…