What are governments doing to protect forest lands in their countries? replanting trees
limiting the output of greenhouse gases
using less paper products
researching alternative materials that can replace timber

Correct

replanting trees

Explanation:

Forest lands and forest based products are good for the countries and the society at large. This is because of its usefulness to the society. Yearly, thousands of tress are felled down for industrial useage or personal useage as a source of fuel.

Due to its effect on the climate, there was a consensus reached by various countries on the need to replenish those trees. This approach of replanting trees is called afforestation.