*Calls grow for laws requiring firms to reveal links to deforestation.*

I am generally skeptical about systems which expect company A to make sure supplier B doesn't engage in practice C. The problem is, A has every incentive not to try very hard to stop B from doing C and covering it up.

I wonder if it might be more effective to impose on all possibly deforestation-related products an import tariff whose rate is based the fraction of deforestation in the country of production since a given base year. The tariff function could be 1/R - 1, where R is the fraction of the forest in the year 2000 which still survives. After 90% deforestation, the tariff would be 8 times the exporter's selling price.