If you enter 0 for everything, the average global temperature change is still +1.8°F.
From the how it works link: http://thealmanacapp.com/question_sources
As an educational tool, this is flawed. Anyone with curiosity and an attentions span longer than 10 seconds will try the 'all zeros', and the message this sends is that purely by existing, you are screwing up the world. This is not true, as best I know!
We're trying to find better frameworks, and one of the ones we've been considering is not to worry at all about talking about the size of our users' footprint, but rather to talk about the benefits of various types of changes in consumption if they were widely adopted. That way the negative situation presented isn't some confusing, oversized and hypothetical scenario, but simply the one we think is happening; and the benefits of one's changes aren't hypothetical, but potentially part of some larger (if unlikely) movement.
We're looking for the best way of presenting information about this issue and the benefits of actions people can take. If you or anyone reading this have any ideas about you'd want to see someone do this, we'd love to hear them.
Additionally, it helps if you paint the most-desired result as attainable. Instinctively we understand that +0 F change is the best. Explain how that might be attained (in a more friendly manner than 'sack and pillage most of the world's population'). The data is against you, but it helps if people feel the ultimate target is not impossible to reach.