Zarian : Loss of native tropical forests accounts for 80 % of carbon emissions . Daniel Zarin : We have never been able to track how much and where trees are disappearing . Daniel Zarin : A new online interactive shows exactly where forests are vanishing and how fast . Similar zero-deforestation pledges have been made by corporate leaders , including the board of the Consumer Goods Forum , a mammoth private sector consortium that includes hundreds of companies with combined revenues of more than $ 3 trillion annually . Countries now can be held accountable , he says , for `` hundreds deforestation '' pledges .
Zarian : Loss of native tropical forests accounts for 80 % of carbon emissions . Daniel Zarin : We have never been able to track how much and where trees are disappearing . Daniel Zarin : A new online interactive shows exactly where forests are vanishing and how fast . Countries now can be held accountable , he says , for `` hundreds deforestation '' pledges .