via: http://modernfarmer.com/2015/03/new-study-finds-light-pollution-inhibits-plant-growth

A new British study has found that plant growth and food webs are adversely affected by light pollution that comes from sources like older-style sodium vapor lights still found in many street lamps. The findings have provoked fears that there could be widespread and permanent impacts on wildlife and ecosystems from light pollution.

http://phys.org/news/2015-03-pollution-shown-affect-growth-food.html