@article{ref1,
title="Ominous trends in nature recreation",
journal="Proceedings of the National Academy of Sciences of the United States of America",
year="2008",
author="Kareiva, Peter",
volume="105",
number="8",
pages="2757-2758",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0027-8424",
doi="10.1073/pnas.0800474105",
url="http://dx.doi.org/10.1073/pnas.0800474105"
}