Table 1.

Present value (PV) of global social costs of CH₄ emissions from lakes and reservoirs, 2015–2050 (billion 2015 US$).

	PV	PV	PV	PV
	Low constanta	High constantb	Low risingc	High risingd
	(1)	(2)	(3)	(4)
SC-CH4 methode
Discount rate = 5%	7496	14,056	8159	19,217
Discount rate = 3%	21,545	40,396	23,643	57,599
Discount rate = 2.5%	30,144	56,520	33,120	81,015
SC-CO2 × CO2-e methodf
Discount rate = 5%	5419	10,162	5881	13,655
Discount rate = 3%	23,017	43,157	25,147	60,158
Discount rate = 2.5%	36,110	67,706	39,493	94,873

^aLow constant estimates assume low current emissions from lakes (4.8 Pg CO₂-eq yr⁻¹), and no change in emissions over time.

^bHigh constant estimates assume high current emissions from lakes (8.4 Pg CO₂-eq yr⁻¹), which stay constant over time.

^cLow rising estimates assume low current emissions, but assume emissions growth of 20%, 2015–2050.

^dHigh rising estimates assume high current emissions, as well as high growth over time (100%, 2015–2050).

^eSC-CH₄ method uses estimates of the social costs of CO₂, CH₄, and N₂O adapted from published sources^16,29.

^fSC-CO₂ × CO₂-e method converts CH₄ to CO₂-equivalents and uses estimates of the social cost of carbon dioxide¹⁵.