① Deforestation and soil degradation cause the release of carbon into the atmosphere, and are responsible for about 25 percent of current and historical emissions of CO2..② Currently in developing countries, there are numerous interconnected drivers
of forest destruction and degradation of soils. ③ Poverty forces poor people to rely on traditional fuels, but other key drivers
include population growth, low food security and land degradation. ④ There are important structural drivers such as weak governance and
inadequate forest protection, and reliance in foreign exchange earnings from the forestry and agricultural sectors.
High discounting of long-term returns and higher risks in forestry weaken incentives for forest conservation and sustainable forestry relative to short-term earnings from converting forests to farmlands or pastures. ⑥ In addition, the external costs of forest destruction and land degradation are rarely valued in markets.

Does "high discounting" mean "high value reduction or high ignorance"? What does the underlined mean?
Does it mean that long-term forestation project doesn't yield as much result as opposed to short-term one?