By Ross Kerber, Simon Jessop and Peter Henderson BOSTON/DUBAI/SAN FRANCISCO (Reuters) – A growing list of global companies are setting a price or charging themselves for each metric ton of their carbon emissions, looking to shape their investments and business for future pollution taxes or other new climate rules. Their prices are all over the place, from less than $1 per metric ton of carbon emissions to $1,600, the most of any company worldwide, set by California drugmaker Amgen. Regulators, too, have offered a range of prices, including the Biden administration’s “social cost” of carbon, ar…