Warming happening more quickly than predicted

While those denying climate change are reducing in number and there appears to be more effort to try and tackle the problem, climate scientists are now fearing that climate change is happening far faster and is having much larger impacts than they ever imagined.
The Arctic plays an incredibly important role in the balance of the earth’s climate. Rapid changes to it can have knock-on effects to the rest of the planet. Some have described the Arctic as the canary in the coal mine, referring to how canary birds used to be taken deep down coal mines. If they died, it implied oxygen levels were low and signaled mine workers to get out.

that despite computer climate models predicting loss of Arctic sea ice by 2050 to 2080, some scientists fear it could be as soon as 2015. The BBC notes similar concerns by scientists, with one quoted as saying the sea ice is “so thin that you would have to have an exceptional sequence of cold winters and cold summers in order for it to rebuild.”
Another BBC article reports scientists now have unambiguous evidence that the warming in the Arctic is accelerating.
The Arctic reflects much sunlight back into space helping keep earth temperate. More melting will result in less reflection and even more heat being absorbed by the earth. A chain reaction could result, such as the Greenland ice sheet melting (which will actually increase sea levels, whereas the melting of Arctic ice will not because it is sea ice), possibly increasing the melting of permafrost in Siberia, which will release huge amounts of methane (as noted above), and rapidly change climate patterns, circulation patterns and jet streams, far quicker than what most of the environment could adapt to easily.
Older members of the indigenous Inuit people describe how weather patterns have shifted and changed in recent years, while they also face challenges to their way of life in the form of increased commercial interest in the arctic region.

For decades, scientists and environmentalists have warned that the way we are using Earth’s resources is not sustainable. Alternative technologies have been called for repeatedly, seemingly upon deaf ears (or, cynically, upon those who don’t want to make substantial changes as it challenges their bottom line and takes away from their current profits).
In the past, some companies and industries have pushed back on environmental programs in order to increase profits or to survive in a tough business world.
It has perhaps taken about a decade or so — and a severe enough global financial crisis that has hit the heart of this way of thinking — to change this mentality (in which time, more greenhouse gases have been emitted — inefficiently). Is that too late or will it be okay?
Economists talk of the price signal that is fundamental to capitalism; the ability for prices to indicate when a resource is becoming scarcer. At such a time, capitalism and the markets will mobilize automatically to address this by looking for ways to bring down costs. As a result, resources are supposedly infinite. For example, if energy costs go up, businesses will look for a way to minimize such costs for themselves, and it is in such a time that alternatives come about and/or existing resources last longer because they are used more efficiently. “Running out of resources” should therefore be averted.
However, it has long been argued that prices don’t truly reflect the full cost of things, so either the signal is incorrect, or comes too late. The price signal also implies the poorest often pay the heaviest costs. For example, commercially over-fishing a region may mean fish from that area becomes harder to catch and more expensive, possibly allowing that ecosystem time to recover (though that is not guaranteed, either). However, while commercial entities can exploit resources elsewhere, local fishermen will go out of business and the poorer will likely go hungry (as also detailed on this site’s section on biodiversity). This then has an impact on various local social, political and economic issues.
In addition to that, other related measurements, such as GNP are therefore flawed, and even reward unproductive or inefficient behavior (e.g. “Efficiently” producing unhealthy food — and the unhealthy consumer culture to go with it — may profit the food industry and a private health sector that has to deal with it, all of which require more use of resources. More examples are discussed on this site’s section on consumption and consumerism).
Our continued inefficient pumping of greenhouse gases into the environment without factoring the enormous cost as the climate already begins to change is perhaps an example where price signals may come too late, or at a time when there is already significant impact to many people. Resources that could be available more indefinitely, become finite because of our inability or unwillingness to change.