Finding connections inside and outside of the university can lead to future employment, valuable experience, and professional certifications. Many organizations have both local and national chapters and others offer special student rates to get you started until you join as a regular member. Here are a few ideas:
Center for Urban and Regional Analysis
Columbus Council on World Affairs
Crop Science Society of America
Environmental Professionals Network
Franklin Soil and Water Conservation District
Gamma Sigma Delta, honor society of agriculture - national
National Oceanic and Atmospheric Administration (NOAA)
Natural Resources Conservation Service (NRCS)
Nature Conservancy - Ohio Chapter
National Marine Fisheries Service
Ohio Department of Natural Resources (ODNR)
Project Management Professional certification, through Project Management Institute or PMP Certification Portal
Society of American Foresters -- brochure and application
Soil and Water Conservation Society
Soil Science Society of America (SSSA)