EDS chairman Gary Taylor told the Herald it was simplistic to blame funding alone for biodiversity decline - something also driven by varied factors such as poor priority setting, "weak regulation" and agency capture - but added the Greens were "right to implicate funding".
The group had asked Prime Minister John Key for more funding for DoC to increase the range of pest management, address tourism pressures and bolster core capacity.
"Species have been in decline in New Zealand since 1300 and it should be possible in 2016 to say that we'll put a stop to that," Mr Taylor said.
"We know what to do, we just need the political will and leadership."
Conservation Minister Maggie Barry has rejected assertions that DoC is underfunded.
"In the last eight years, we've put in an extra $90 million into DoC's baseline funding," she told TVNZ's Q&A programme yesterday.
Ms Barry said the level had increased from $316 million to around $380 million today.
"So the idea that Cabinet hasn't prioritised it is wrong."
Further, conservation had benefited from extra funding that had come through from partners and collaboratives, including $100 million over 10 years from the Next Foundation and Project Janszoon, some of which was shared with DOC projects.
But she acknowledged tourism presented "enormous challenges" to conservation.
"I've had talks with the Prime Minister and with the Associate Tourism Minister, Paula Bennett, about ways in which we can ensure that we allow as many people as we can into our estates but that those people don't damage the very place they come to visit and want to see in a pristine state."