What is the fine-grained topic of the following text: Since 2012 we have offset more than 50,000 tons of CO2 associated with the production of Keraflex Maxi S1 Zerø in Italy through the acquisition of environmental certified credits: in 2017 credits for the reforestation of a depleted area in Uruguay of more than 21000 hectars. Only return the topic.
Offsetting carbon emissions through environmental certified credits and reforestation