Conditional GHG reduction options. Emission reduction in 2030 per option kt/year. Conditional GHG reduction options. Emission reduction in 2030 per option kt/year. Cogeneration in industry. 31.16. Solar LED lamps. 2.75. Waste heat recovery at cement plant. 61.56. Assisted forest regeneration. 391.88. Efficient domestic lighting with CFLs. 39.11.