New Scientist puts notes the ecological foot paw print of pets.
The calculations are done in terms of energy per acre, which is something of an apples and oranges comparison. A better calculation would be in terms of pollutants as there are many energy sources with much greater energy densities than the land use given here.
Moving to a CO2e calculation, one finds that beef is really bad - puff and fido should be eating meat in the form of chicken. Of course you should too or, better yet, move to as much of a vegetarian diet as you can. You can't put a dog, cat or ferret on a vegetarian diet though - they aren't made for it.
A huge point is missed. Assuming we manage other areas of carbon emissions, we don't have to drop to zero. Having a pet, for many, is seriously important. Some people have companion animals rather than children. Probably the worst thing you can do to the environment is have children past the number required to sustain population. The emissions produced by an extra American are enormous.
It looks like the amusement park at Coney Island is being torn down for development - so sad. It had a certain tackiness to it that is a major feature of the place. Last July Sukie, Colleen and I were able to spend some time there and rode the fabled wonder wheel.
There are many poor designs out there. Going to a good bike shop for an appropriate bike and fit is good advice for anyone. This is one of Colleen's messages - get properly fitted for the right bike and you'll be a lot happier. She stretches the limits for fit, but it is possible.
Sukie has some stability issues and needed a lightweight trike. The local Trek dealer did a good job of fitting it as closely as possible to her frame - a huge difference.
On the other hand some communities like Copenhagen are an order of magnitude more successful (and Bjarne would point out Aarhus). Here is a video giving a sense of the mean free path between bikes there.
Many are working on this and we know through the examples of Denmark and the Netherlands that real success is possible.
Here is someone with a project I suppot - she is going after making kids and their parents seeing biking as an attractive, cheap and fun way to do most of your short trips. I am a big fan of being positive. There are many people and groups you can help.