SAO PAULO, June 18 (Reuters) - Brazilian investment bank

BTG Pactual's forestry arm said on Tuesday it agreed

to sell 8 million carbon offset credits to Microsoft ( MSFT ),

the largest-ever sale of such credits.

BTG Pactual Timberland Investment Group (TIG) did not

disclose financial details of the transaction, which MSCI Carbon

Markets said is the largest known carbon dioxide removal credit

transaction to date.

Microsoft ( MSFT ) did not immediately respond to request for

comment.

Carbon offsets allow companies to offset some of their

greenhouse gas emissions by paying for actions to cut emissions

elsewhere. Each credit represents the reduction of one tonne of

carbon dioxide emissions and can be used to meet corporate

climate goals.

BTG Pactual TIG said the credits were generated by its

forest restoration projects in Latin America.