China rolled out a tidal wave of new legislation and action plans to bolster its drive to switch from fossil fuels to green energy, as early indicators suggest it has reached peak emissions six years early. China is emerging as the global green energy champion after renewable energy recently overtook coal in its energy mix. China remains the world’s biggest emitter of CO₂, accounting for more than a quarter of total emissions, but still has plenty of wiggle room as its carbon budget – the amount of emissions permitted to each country by the Paris Agreement in 2015 – is still in surplus. It is …