Graphs with 3 Variables/Parameters - How to make this look better?

[Joker_Hazard]

Hello everyone...

I am having a lot of trouble to make a few graphs. Basically I have three paraments:

- Weeks as Date

- Environment 

- Quantity of Defects

I need to show a few correlations between all three variables and I tried to make this by using a bar chart and didn't look good.

Next I tried to split by weeks (which is my objetive) and didnt look good either.

Is there any statistical tool of something that I am missing out to make this look better and be able to present this to a group of managers?

It would be much appreciate if someone could help me out with thinking of a range of possible correlations ..

Thank you very much!

[Joker_Hazard]

Guys.. Really need help with this one. Thank you!