"This means minimising the carbon we produce coupled with planting far more trees, much like my husband and I do with our community.
"My main message to the diverse range of our Hikoi for Unity friends and whānau is that our collective mission must be to leave this planet in a better state than when we came into it," she said.
Former New Plymouth mayor, and social activist Andrew Judd, also spoke.
The self-acclaimed "recovering racist" drew criticism for his calls for Maori to have half-representation on councils but has maintained a stance concerned about addressing the wrongs of New Zealand's colonial past.
Judd said the hikoi was about "coming together as a community and a larger whanau to talk about peace and inclusion".
"I felt very welcome in Napier. There were children right through to, well Pat himself, at 93, it just shows that age isn't a barrier to love and inclusion."
He said we are "maturing slowly as a nation".
"It gives you hope for the future, absolutely."