One of my main concerns is protecting tropical forest and this organization is building one of the best reputations for doing this.
DU does a great job at preserving wetlands.
Internationally we contribute to the INTERNATIONAL CONSERVATION FUND OF CANADA. This group is Canada's only global conservation charity. There are numerous projects you can specify for your donation . We tend to look at aquiring habitat or protecting reserves from mining and logging as high priority.
ICFC top ranked conservation charity in the Financial Postcharity ratings.
Examples: With ICFC and others(Fundación Jocotoco) a key property was acquired in 2014 to enlarge Buenaventura reserve.