A Newsletter Notice

I am having difficulty understanding the following notice which I saw in a parish newsletter this weekend, and was wondering whether anyone could help shed some light on it.

Friday 15th February is Family Fast Day when we are encouraged to FAST [I can understand what this means, though I am not very good at it] and PRAY [I can understand this as well, and might be a bit better at it than I am at fasting, because I try it more often] and think about our relationship with creation. [This is the bit that defeats me.] A retiring collection will be taken up at all Masses next weekend for CAFOD. [I can understand this sentence in isolation, but am struggling to see its connection with thinking about my relationship to creation.]