Your best bet when searching for jobs on the Web, especially entry level jobs, is to search the classified ads of newspapers. Most employers don't waste their time listing on a bunch of databases unless they are having a particularly difficult time filling a particular position. Because of this, B.S. Degree Jobs are the hardest to find on the Web. It is tedious, but environmental jobs are still a specialty. Most state employment offices still don't have classifications for most of the job titles .
Government agencies are the best at maintaining job pages.
The quickest way to find jobs, short of having a subscription to an automated list, is to use search engines. The problem is that it takes time for jobs to be indexed. The two search engines we use the most here to find jobs are Excite and AltaVista since they seem to index jobs quickly. The other problem is that it is hard to sort jobs out from other related web pages. Take time to read the instructions for search engines and learn to use their extended capabilities.