In the past several years, there has been a growing concern over the effect of global warming on the climate. (hubpages.com)
Whilst private security solutions in schools is not a new concept, there is still much debate over its effect on the learning environment. (educationbusinessuk.net)
Global warming was once an uncommon term used by a few scientists who were growing concerned over the effects of decades of pollution on long - term weather patterns. (science.howstuffworks.com)