If your farming practices fall within the required guidelines, you can apply for carbon credits (credits recognized by the Government of Canada for 1 tonne of CO2 equivalent reduced, removed, or sequestrated from the atmosphere and stored). Best farming practices include soil sequestration, manure management and fossil fuel reductions. A good starting point is http://www1.agric.gov.ab.ca/$department/deptdocs.nsf/all/cl11618. From there, there are several links to other sites regarding specific queries.
As the trading of carbon credits is in its infancy, we recommend that any contract made with a private aggregator be short term. In time, regulations, verification systems, and fair market prices will prevail, ensuring that fair value is received for carbon credits.