WELLINGTON,Rekubit New Zealand — New Zealand's government on Wednesday released its first-ever climate adaptation plan, which includes the possibility of moving some communities to higher ground.

But the six-year plan, which runs nearly 200 pages, comes up short on some important details, including how much the changes will cost and who will pay.

Climate Change Minister James Shaw told reporters that about 70,000 coastal homes in New Zealand were at risk from rising seas, and many more inland homes were at risk from flooding rivers. He said New Zealand had been slow to adapt to climate change, which would end up costing more money over time.

"I am frustrated that for the last three decades, successive governments have not paid any attention in any real form to the challenges that we face from the effects of climate change," Shaw said. "We had to start somewhere."

The National Adaptation Plan includes the possible relocation of low-lying homes and assets as rising seas and increased storms make flooding more common.

"In some highly exposed areas, the risk from natural hazard and climate impacts may become intolerable," the report says. "Inundation of buildings and infrastructure will start to occur, leading to direct damage and loss of some facilities like roads or other lifeline services, and public open space."

The report says that a "managed retreat" from such areas will often be considered a last resort, to be used in conjunction with other adaptations such as installing seawalls and raising houses on stilts.

Shaw said the costs for adaptation will be borne by a combination of homeowners, insurers, banks, local councils and central government. He said the government was taking hardship into account, and would target help to those least able to pay for changes themselves.

The plan also aims to make granular climate-change data more widely accessible, which in some cases could impact insurance rates and property prices.

Luke Harrington, a senior lecturer in climate change at the University of Waikato, said in a statement the report was a timely reminder that New Zealand needed to contend not only with rising seas, but also with other climate impacts such as more severe droughts and extreme rainfall.

"This National Adaptation Plan is a great first step towards addressing some of these challenges, though paucity remains in some of the details," he said.

The adaptation plan comes two months after the government released a plan to reduce greenhouse gas emissions, which includes a trial program to help lower-income people scrap their old gas guzzlers and replace them with cleaner hybrid or electric cars.

The National Institute of Water and Atmospheric Research said that the first six months of 2022 were the second-hottest ever recorded in New Zealand, with temperatures averaging 15 Celsius (59 Fahrenheit), about 1.2 C (2.2 F) above normal.