Cancer Research UK says people should not use artificial tanning devices for cosmetic purposes because they - like the sun - increase skin cancer risk.

BBC: NEWS | Health | Europe issues warning on sunbeds

Elsewhere in the gardens, 18 "supertrees, " artificial treelike structures between nine and 16 stories high, will offer shelter from the blazing Singapore sun.

WSJ: Singapore to Open Gardens by the Bay

All organic crop rotations contain three to four years of no ploughing because grass leys use the sun's energy to fix nitrogen for subsequent crops in place of oil-based artificial fertiliser.

ECONOMIST: Organic matter