An independent study conducted in 2008 by Uniross, a European manufacturer of rechargeable batteries, says that rechargeable batteries have up to 32 times less of an impact on the environment as compared to disposable batteries. When disposable batteries are thrown out, they end up in landfills and release dangerous, toxic chemicals into the environment. Because rechargeable batteries can be reused hundreds of times instead of just once and then thrown away, the impact and waste on the environment is greatly decreased. This fact also makes rechargeable batteries more cost effective, since less money is spent buying disposable batteries when they die. This study also found that another important environmental advantage of rechargeable batteries is that they have up to 28 times less of an impact on global warming and 30 times less of an impact on air pollution.