Outsize

Because forests are massive sponges of carbon dioxide, reversing their loss would play an outsize role in fighting climate change.

Source: tatoeba (9465496)

1958, P. G. Wodehouse, The Fat of the Land, in 'A Few Quick Ones', Everyman, London: 2009, p 11. ...the contents of the kitty amounted to well over a hundred pounds. And it was generally recognized that this impressive sum must inevitably go to the lucky stiff who drew the name of Lord Blicester, for while all the starters were portly, having long let their waist-lines go, not one of them could be considered in the class of Freddie's outsize uncle.

Source: wiktionary

Small changes in initial conditions can have an outsize effect on the course of events.

Source: wiktionary

[Leslie] Wexner is among a small number of Jewish community megadonors, billionaires who provide an outsize and growing proportion of funding for communal organizations and to a large extent determine what those organizations look like.

Source: wiktionary