you should get better sources for your standpoint as well, friend!
not entirely sure what the graph at
0:20 is trying to say, but it seems to be the change in temperature from 1997 to 2016? it's not specific enough to draw a concrete conclusion from and there's no source attached, so I'm not going to draw any conclusion from it.
here's a graph depicting average global temperature anomaly from
Berkeley Earth, a independent non-profit dedicated to studies of land temperatures:
View attachment 22341
and if that wasn't clear enough for you, here's a global map for 2017 of temperature anomalies relative to 1951-1980 averages:
View attachment 22342
notice how the most drastic temperature changes are in the arctic? that means that the extent to which the ice there forms yearly is decreasing! this creates a feedback loop that accelerates warming. ice in general is more reflective of sunlight than seawater because it's white while seawater is dark. the more ice there is, the more sunlight is reflected back into space (this is the effect of the
earth's albedo: the more reflective a body is, the less light energy/heat it absorbs or keeps in its atmosphere). but the less ice there is, the less sunlight is reflected back into space and kept in the atmosphere. this traps more heat on earth, accelerating warming and melting more ice, which keeps more heat on the planet, and so on. and here's the
national snow and ice data center on the decreasing extent of arctic sea ice.
there's other feedback loops in the arctic that explain why it's so warm relative to the rest of the earth and that i don't feel like explaining because i still have 4.5 minutes left of this cruddy video to watch and write about, but
this article does a nice job of summing some of them up (like the melting of permafrost releasing CO2).
so why should we be concerned about the increasing temperatures in the arctic? well on top of decreasing the planetary albedo in an effect already explained, the melting Greenland Ice Sheet will raise sea levels globally
about 20 feet, ocean currents could change (which would mess up the gulf stream, which is a massive problem on its own), and winter weather patterns will change. I got all this from
here, but you can literally just look up "effects of arctic sea ice melting" and get information from so many other sources.
onto the next part of the video!
0:34 technicality that I take issue with is that global warming and climate change are different things. global warming refers to the warming of the earth due to human emissions. climate change refers to the change in the earth's climate due to global warming. in most contexts they can be used interchangeably, but it's important to note this.
here's nasa writing about this distinction.
0:50 using 3 groups to define all sides of the climate change issue is a gross simplification of the issue. you've got
climate refugees,
climate scientists,
climate deniers,
governments,
NGOs, etc., each of which have a gazillion subdivisions within them and different interactions between them, but for the purpose of his point sure, I'll give him this.
1:00 his point for this section of the video is that the only scientists that think climate change is real sit on the IPCC. his tactic here is to again undermine the proof of climate change by mentioning only one scientific group.
other groups exist. this is just a weak point.
1:12 while human CO2 emissions are the main cause of global warming, there are other things that contribute. things like coolants in refrigerators indirectly contribute by wrecking the ozone layer, methane emissions from cattle accelerate warming, and deforestation globally contributes in two ways in that forests naturally serve as a
carbon sink (something that takes in more carbon/CO2 than it emits), and getting rid of them inhibits this and keeps more CO2 in the environment AND the methods of deforestation emit CO2 in large amounts as well. here's a map from the WWF showing the extent of global deforestation:
View attachment 22348
but again, I'll give him the benefit of the doubt and say maybe he's just using a vague term to help people understand his point.
1:23 "this might eventually dangerously heat the planet" see the two graphs above for why this is wrong. the planet is already heating up to a dangerous extent.
here's why hurricanes have been getting stronger in the past few years and why they will get more rainy, why
europe's recent deadly heat waves happened and why they will become more frequent, and
why 50-year floods will become more frequent as a result of climate change. all these effects will grow stronger and more frequent as the planet heats more. things are already pretty dangerous if you were to ask me, but maybe his definition is different and that's the point he's trying to make. moving on.
1:31 he's not specifying any particular group here like he did for his "Group 1" moniker to
make them seem more prevalent than they actually are.
1:41 wonderful! he's finally given his reason as to why he says the climate is changing. I'll dissect each of these:
the sun: yes, the sun
can change the earth's climate. the issues with this argument though are that these changes are cyclic, occur on either geologic or very short timescales, and
change earth's climate relatively little over the timescale in question. so no, this is not the cause of the climate warming.
the clouds: again,
can change earth's climate, both warming and cooling. but the
effect of climate on the clouds is much more noticeable than clouds on climate. as the climate changes due to manmade causes, clouds will continue to do their net-neutral sorta thing.
the oceans: yes oceans do change the climate (see:
el niño/la niña). already gave you one reason why the oceans cause warming with the albedo feedback loop, but
ocean currents will change with melting ice which will
effect weather patterns. so that's cool! also, the
oceans are turning to acid as a result of climate change. similar to clouds in that they effect earth's climate, but as the planet warms their effects will change with it.
earth's orbital patterns: I'm assuming he's referring to milankovitch cycles. yes,
earth's orbit does change. yes, this
changes the global climate by effecting the amount of sunlight is received. but these changes occur over a period of thousands of years. the period of climate change we're currently looking at is about 150 years. it's not significant.
many other reasons: purposefully vague point, but yes, true.
1:50 "none of these is fully understood, and there is no evidence that CO2 emissions are the dominant factor" where is his evidence that none of these are fully understood? yes, he's right in that we know the earth's climate is a
super complex system, and as a result of that it's hard to judge the effects the individual effects of each of these on earth's climate (sidenote: that's why the weather can't be accurately predicted more than like 2 days out. you'd have to know the movement and properties of every particle on earth and the way they'll interact with one another in order to do so). but what we do know is that they're individually not enough to account for the rapid change in the earth's climate. in fact, the only thing we know that could have caused this rapid warming is
human emissions of CO2 and other greenhouse gases. the more gases in the atmosphere, the more heat is trapped on the planet. this is the
greenhouse effect. venus is
evidence of this. we know
human emissions are doing this because of
atmospheric measurements and
ice core samples. CO2 emissions have only gone up since the industrial revolution:
View attachment 22351
and as such the earth has only gotten warmer.
i watched more of the video earlier and i would write more but i'm tired, i'm nearing the word limit i think, and i dont watch to watch this maroon any longer. climate change denial is a disease and we're all going to die because of it.
edit:
octo covered everything i didn't haha.
Click to expand...
