"Unless nations step up their efforts to protect what natural habitats are left, they could witness the disappearance of 40 percent of amphibian species, one-third of marine mammals and one-third of reef-forming corals. More than 500,000 land species, the report said, do not have enough natural habitat left to ensure their long-term survival."
A summary can be found here: https://www.ipbes.net/sites/default/files/downloads/spm_uned...
Also, "one-third" is not "most".
"Human actions threaten more species with global extinction now than ever before. An average of around 25 per cent of species in assessed animal and plant groups are threatened(figure SPM.3), suggesting that around 1 million species already face extinction, many within decades, unless action is taken to reduce the intensity of drivers of biodiversity loss. Without such action there will be a further acceleration in the global rate of species extinction, which is already at least tens to hundreds of times higher than it has averaged over the past 10 million years."
The report doesn't factor in insect decline and how that will effect the rest of the foodchain (they are the words biggest pollinators). It does bring up the staggering loss of insect biomass:
"Population declines often give warning that a species’ risk of extinction is increasing. The Living Planet Index, which synthesises trends in vertebrate populations, has declined rapidly since 1970, falling by 40% for terrestrial species, 84% for freshwater species and 35% for marine species (established but incomplete){2.2.5.2.4}. Local declines of insect populations such as wild bees and butterflies have often been reported, and insect abundance has declined very rapidly in some places even without large-scale land-use change, but the global extent of such declines is not known (established but incomplete){2.2.5.2.4}. On land, wild species that are endemic (narrowly distributed) have typically seen larger-than-average changes to their habitats and shown faster-than-average declines (established but incomplete)."
Edit: also, in the future, let's refrain from the "not smart enough to understand" style arguments on HN.
They're connected. I mean, everything is.
Even if we didn't emit so much CO2, we destroy habitat for other species through agriculture and forest harvesting. And if we hadn't destroyed so much habitat, there'd be lots more slack for CO2 emissions.
And as you say, destroying habitat through biomass energy production -- whether it's fast-growing trees for pellets, or palm oil for biodiesel -- just makes it worse.
I was in a hurry, and didn't say how habitat loss increases extinction rates from global warming. The issue is habitat fragmentation. We degrade/destroy habitat for other species through agriculture, forest modification and harvesting, urbanization, road building, etc. But that not only decreases the amount of high-quality habitats. It also fragments habitats.
Without global warming, habitat fragmentation hurts other species in various ways. At some point, fragments become too small to support viable populations for many species. Especially larger animals, for example. But overall, it's not a huge issue, relative to the amount of habitat loss itself.
However, with global warming, habitat fragmentation becomes a huge issue. As the planet warms, species tend to shift toward the poles, more or less, to stay in habitats that they're adapted to. But when habitats are fragmented, that can't happen. And so you end up with isolated populations on mountains, for example. Given that "up" ~ "away from the equator". And with further warming, there's no more up, so they die off. One mitigation is creating habitat corridors. Through cities and farmland. Across roads, using bridges or tunnels. You can see habitat bridges in I-78 in eastern New Jersey.
Another factor is the speed of anthropogenic global climate change. It's too fast now for evolutionary adaptation.
Someone could be forgiven for thinking you have an interest in fossil fuels.
Edit: I see from your CV that you have a history of working with the fossil fuel industry - specifically, Exxon in Calgary in the early 80’s. I think it’s safe to disregard anything you have to say on the topic.
Besides this, it's rude to address other community members this way. Just email us at hn@ycombinator.com if you have such concerns, we take them seriously and we have better options for addressing them.
I have never worked for Exxon. I've no idea how you came up with that idea. I once worked briefly, 39 years ago, for a company that did production accounting for oil wells. I once worked, 30 years ago, for a SCADA company that may have had oil industry customers, though my recollection is that they had more to do with municipal water systems. The tendency of global warming alarmists to claim, on no evidence whatsoever, that any critic is funded by the fossil fuel industry is one of their most despicable characteristics (up their with trying to equate their critics with Holocaust deniers).
Edit: though now I’m curious by percentage of animals (presumably 40% of species may be, or even is likely, more than 40% of animals, because of power-law-style distributions).
