Not quite.
Some acts might have more impact, and some less. It's a matter of looking at the impact in the aggregate.
And cutting back, might not mean cutting out completely. For example, I might climb at Snoqualmie Pass more and Washington Pass less. I might buy replacement gear less often, rather than not at all, and buy used more often or rent/borrow more (although the latter might involve driving to pick up and drop off...).
my point is that if EVERY bit counts... then exactly that. EVERY BIT. climbing at snoqualmie has impact...you can take that impact away by not going.
unless it isn't that much of a dire situation. global warming, that is.
it's not all or nothing