J. Phys. IV France
The "anthropocene"P.J. Crutzen
Max-Planck-lnstitut for Chemistry, J.-J. -6echer- Weg 27, 551 28 Mainz, Germany
Abstract © EDP Sciences 2002
Human activities are exerting increasing impacts on the environment on all scales, in many ways
outcompeting natural processes. This includes the manufacturing of hazardous chemical compounds which are not
produced by nature, such as for instance the chlorofluorocarbon gases which are responsible for the "ozone hole".
Because human activities have also grown to become significant geological forces, for instance through land use
changes, deforestation and fossil fuel burning, it is justified to assign the term "anthropocene" to the current
geological epoch. This epoch may be defied to have started about two centuries ago, coinciding with James Watt's
design of the steam engine in 1784.
The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access.
An OpenURL link contains article metadata and directs it to the
OpenURL server of your choice. The OpenURL server can provide access
to the resource and also offer complementary services (specific
search engine, export of references...). The OpenURL link can be
generated by different means.
If your librarian has set up your subscription with an
OpenURL resolver, OpenURL links appear automatically on the abstract pages.
You can define your own OpenURL resolver with your
In this case your choice will be given priority over that of your library.
You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see
You should disable this module if you wish to use the OpenURL server that you or your library have defined.