Is there someplace where I can check the exact stats of events and buildings for each difficulty? I'd like to develop my strategies but I need more information to do so. 

For example, what does blizzard do exactly:

- does it increase food and wood consumption by a flat amount
- does it increase them by % based on current usage?
- are the values related to the difficulty in any way?
- and what number and percentages are we talking about exactly

Are tool upgrades applied to individual workers or to all of them together? how are number rounded??

Is this information available anywhere?