School Flashcards
(221 cards)
Tipping point
Tipping points occur when change in part of the climate system becomes (i) self-perpetuating beyond (ii) a warming threshold as a result of asymmetry in the relevant feedbacks, leading to (iii) substantial and widespread Earth system impacts.
Tipping point example
Were the west Antarctic or the Greenland ice sheet to be destroyed, sea levels around the world would rise by at least fifteen feet. Were both ice sheets to disintegrate, global sea levels would rise by thirty-five feet. It could take centuries for either of the ice sheets to disappear entirely, but once disintegration got underway it would start to feed on itself, most likely becoming irreversible. Other catastrophes have similar built-in delays, which follow from the tremendous inertia of the climate system. DAI is therefore understood to refer not to the end of the process-the moment when disaster actually arrives-but to the beginning of it: the point at which its arrival becomes unavoidable.
a tipping point announces
the beginning of the end. Once it is reached, the ice will melt and flow into the oceans, the ocean currents will slow down, or stop, the forests will burn and die.
And all these disappearances—the gone glaciers, the stilled currents, the razed forests—will further increase the amount of carbon dioxide in the atmosphere, further limit the planet’s ability to absorb carbon and to reflect heat back into space, further heat up the planet, and trigger more tipping points.
How does climate change work
As the planet heats up, it produces changes that release more carbon and other gasses into the atmosphere which then increase the heating of the planet. Such cycles are called feedback loops, where the impacts of a situation accelerate and strenghten the situation that caused the impacts.
Humans cut down forests. They burn some of the trees and thus both release carbon dioxide into the atmosphere as they reduce the earth’s ability to absorb carbon dioxide. Where those forests once stood, humans plant irrigated mono crops that depend on diesel pumps, or raise hudrends of thousands of cattle producing methane, they build cities and roads which then fill with cars burning gasoline, buidlings and homes that depend on coal-fire power plants [now more likely natural gas], and entire industries fueled with coal, gas, and oil. All these human activities release more and more greenhouse gasses into the atmosphere, which does not get reabsorbed by the felled trees.
And so the planet heats up. And then, for example, the permafrost thaws, and as it does, the previously frozen organic matter decays and releases more carbon into the atmosphere, further heating the planet, melting glaciers, which then accelerates further melting and heats the planet, melting ice sheets which then reflect less heat back into space, further heating the planet, provoking worsening forest fires, which then release more carbon into the atmosphere and further heat the planet.
Paris Agreement
Purports to be a legally binding interational treaty to hold the global average temeprature below 2 C above pre-industrial levels.
Nearly ten years later, greenhouse gas emissions have reached an all-time high, for two years in a row.
What are the major tipping points
Melting ice, shifting air and ocean currents, and the deaths of the amazon raiforest and boreal forests.
The Amazon’s future?
Multiple studies show that only a slight further increase in average global temperatures and/or the continued cuting and burning of portions of the forest will turn the entire Amazon rainforest, the earth’s largest and most biodiverse, into a savannah.
The most immediate risk to the Amazon comes from fire: landowners clearing the forest for agriculture, ranching, illegal logging and mining, as well as fires that spread out of control due to drought conditions provoked by climate change. If the rates of deforestation in Brazil, which increased widely during Jair Bolsonaro’s administration, continue apace for another 5 to 10 years, the damage would be irreversible.
Global warming and drought effect on rainforests
As global warming creates drier conditions through longer dry seasons and more severe droughts, deforestation also increases dryness by removing all the plant life that gathers and recycles water through transpiration (plants releasing water vapor that will drift high over the forest canopy and fall back to the earth as rain).
The warmer the planet becomes, the drier the forest becomes. The more trees that are cut down, the drier the forest becomes and the more trees and other plants that will die, provoking more dryness. The more fires that are set to clear the land the more carbon is relesed into the atmosphere, increasing global warming.
Amazon dieback
A dieback is generally a condition in which a parisite or disease attacks the edges of the leaves or the tips of the roots of trees and woody plants and begins to kill them by advnacing from the periphery to the core.
This is happening on a massive scale with humans as the parisite. Scientists talk about “widespread Amazon dieback,” the process by which combined deforestation and global warming is killing not one tree or thousands, but a tropical rainforest twice the size of India.
What is a Super PAC
A group that can raise and spend unlimited money independently to support or oppose candidates, but cannot donate directly to them.
What is red boxing
A campaign loophole where candidates can publicly post strategic guidance to Super PACs without direct coordination
What are dmocracy vouchers
Publicly funded vouchers given to citizens to donate to political candidates or causes, aiming to democratize campaign finance.
Why is money in politics problematic?
Because it creates undue influence, where politicians become beholden to wealthy donors rather than voters (think green primary).
PAC
Can donate directly to candidates but with strict limits on contributions
Super PAC vs PAC
Super PACs can take unlimited donations and spend independently, while PACs have donation limits and can donate directly to candidates
What is the biggest coordination loophole between Super PACs and campaigns
redboxing
Why are large contributions harmful
They centralize access and influence in a few hands, reducing democratic responsiveness.
How can grassroots groups be empowered through vouchers
Letting people donate their vouchers to trusted groups who can pool and direct funds strategically
What is tenure in K-12
Legal protections that make it harder to fire teachers without due process, typically granted after 2-3 years.
Value added modeling
A method to estimate a teacher’s impact on student learning, controlling for prior performances
Housing first
A homelessness policy that provides stable housing before addressing other issues
Why is California’s housing crisis so severe?
Zoning restrictions, high costs, mild weather, and fragmented response.
Tweedism
A system where the powerful control nominations, undermining democratic representation
Green primary
A money-based first round that determines candidate viability before voting even begins