Natural Resources Defense Council
Sierra Club: NY City Chapter
NYC Million Trees Project
Human Impacts Institute

The following site provides a comprehensive list of environmental organizations in the city.
TreeBranch Network

The Fordham Community Service Office assists students in arranging internships in urban ecology and environmental justice at the Crotona Park Nature Center, Bainbridge Urban Garden, Bissel Community Gardens, and Sustainable South Bronx. See internship descriptions. Students may also consult the Global Outreach Program, which organizes environmental projects such as "Go Mohawk."

Internships in organic agriculture in the area are available with the following organizations.
GROWNYC
WWOOF-World Wide Opportunities on Organic Farms USA
Just Food-CSA in NYC
Bronx Bainbridge Urban Garden
Bronx Bissel Community Gardens
Manhattan Battery Urban Farm
NYC Community Gardens List

Internships in nutrition and public health can be sought through Fordham's Pre-Health Program:
Pre-Health Program Volunteer/Internship Opportunities

Internships and jobs in business can be sought at the following businesses.
Sustainable Business Network, New York City
Westchester Green Business Challenge
Great Forest Sustainability Solutions
Karbone, A Renewable Energy and Environmental Markets Firm

Environmental design internships and employment (architecture, landscape design, urban planning) can be sought at one of the city's many respected firms of architecture and landscape design, city government departments, and non-profit community development organizations.
NY City Dept. of City Planning
NY City Dept. of Design and Construction
NY State Energy Research and Development Authority
Design Trust for Public Space
Gaia Institute
AltPower


The following site provides a list of environmental organizations in Westchester County north of the city.
Federated Conservationists of Westchester County

Internships and employment are also available in the greater city area at the following state and federal government agencies.
New York State Government Internship Program

United States Environmental Protection Agency 

U.S. Fish and Wildlife Service
U.S. Geological Survey

Paid summer research internships in the United States and around the world are available in the National Science Foundation's Research Experiences for Undergraduates Program (stipend of $3000-4000 plus expenses).
NSF REU Program

Paid and unpaid summer internships are available in the New York City area and beyond.

Fordham University Louis Calder Center (Armonk, NY)

Cary Institute of Ecosystem Studies (Millbrook,NY)

Mohonk Preserve(New Paltz, NY)

Mianus River Gorge Preserve
NYC Department of Environmental Protection
NYC Department of Parks
Student Conservation Association
Eco-Practicum in the Catskill Mountains, NY (unpaid)
New York State Government Internship Program
World Wildlife Fund

The following internship and employment opportunties are available in Washington, D.C.