[rmolnav]

In the hotter parts of the world, peak power consumption occurs in the hotter months, to drive air-conditioning.

per capita in the richer areas, yes, but over the entire population, the majority of whom live between the tropics where there is very little seasonal variation in temperature, no. And north of the tropic of cancer the maximum temperature occurs in July, not May.[/quote]
Is utter NONSENSE to discuss about any possible short-term correlation temperatures/CO2 emissions, because emissions during short periods CAN´T affect temperatures significantly ...
Global warming is an increase of global/annual average temperatures as a result of "billions" of relatively little CO2 emissions over long periods of time. Over just a few months, meteorological temperature changes are the only changes that can be perceived !!

[Bored chemist]

Is utter NONSENSE to discuss about any possible short-term correlation temperatures/CO2 emissions, because emissions during short periods CAN´T affect temperatures significantly ...

Well, yes you can.
But the cause and effect are the other way round.
People burn more fuel to keep warm in cold weather.
So low temperatures drive increased CO2

However, They also use the aircon less.
And Winter isn't the same across the whole world.
And then there's all tehindustrial use which isn't especially seasonal.

We could guess at all those factors.

Or we could just look at oil production figures
https://www.iea.org/classicstats/monthlystatistics/monthlyoilstatistics/

Oil production just isn't seasonal. (OK use might be more so but... prove it)
So the annual variation of about 10 ppm on the CO2 plot is down to essentially seasons, and the rising trend from 300 to 400 is down to us.

[Petrochemicals]

Electricity use greatest in the summer due to AC, probably only since the invent of the eco light bulb, energy use greatest during the winter.

Leaveson deciduous trees are a small fraction of carbon and effort on the trees part, its why they can be lost with little loss. Pines also loose leaves, these are more robust.

Over the last 15 years the temperature has fluctuated wildly., even though carbon has remained relativley constant.

[jeffreyH]

Over the years the climate models have failed to predict how bad things will get and how fast they will get there. This goes to show that we know sod all about how the climate will "misbehave".

It usually just goes worse than anticipated. When the car is hurtling towards the cliff is not the time to be wishing you had fitted brakes.

[Bored chemist]

Over the last 15 years the temperature has fluctuated wildly.

This is what we call weather.
It's tangentially related to climate.

[jeffreyH]

The only bright spot in this tragedy is that fat boy orange's mar-a-lago golf club, aka 'the southern whitehouse', will be under water once Greenland melts completely. Can agent orange swim?

[alancalverd]

Over the last 15 years the temperature has fluctuated wildly.

This is what we call weather.
It's tangentially related to climate.

It's all the same series of numbers, some measured, some adduced from proxies. When does weather become climate?

[evan_au]

When does weather become climate?

I suggest that the boundary between weather & climate can be drawn at a 10-year average of temperature, rainfall, ice cover, etc.

Rationale: Given the known or potential drivers like:
- Diurnal cycle: 24 hours
- High/Low pressure regions, Warm/Cold fronts: Days to weeks
- Seasons: 1 year cycle
- Sunspots: Roughly 11-year half-cycle, but has a relatively small impact
- El Niño: Quite random, with a range of 2 to 7 years, but has a measurable global temperature impact
- Volcanic eruptions:  Extremely random, but a big one can have a measurable impact on global temperatures for a year or two
- Milankovitch Cycles: Thousands of years, ie unlikely to be confused with anthropogenic changes in the last century

If it wasn't for irregular events like volcanic eruptions and El Niño, even a 1-year average global temperature temperature shows a clear trend.
- It is still possible to "subtract out" the impact of a volcanic eruption (measure atmospheric dust) and El Niño (the intensity of the El Niño can be measured).

See: https://en.wikipedia.org/wiki/El_Ni%C3%B1o#Occurrences

[Bored chemist]

Over the last 15 years the temperature has fluctuated wildly.

This is what we call weather.
It's tangentially related to climate.

It's all the same series of numbers, some measured, some adduced from proxies. When does weather become climate?

If you don't even understand that, why have you been posting in threads about climate?

[alancalverd]

I understand it, but every time someone gives you a counterexample to your hypothesis you dismiss it as  weather, which makes me wonder how you define climate.

[Bored chemist]

I understand it, but every time someone gives you a counterexample to your hypothesis you dismiss it as  weather, which makes me wonder how you define climate.

Do you not agree that the wild fluctuations of temperature over 15 years are weather?

[rmolnav]

Do you not agree that the wild fluctuations of temperature over 15 years are weather?

The curve of mean anual global temperature is the result of weather and other oscillating factors (mainly sun radiation and ocean current yearly distribution), and the underlying continuously increase of greenhouse effect, due to CO2 and methane emissions (and positive feedbacks, such as increase in atmosphere absolute humidity, albedo, etc).
Years ago oscillating factors, in years with annual annual cooling due to them, this could prevail over underlying greenhouse effect warming. But recently most years the opposite happens, due to the relatively enormous atmospheric accumulated CO2 concentration ... Even independently from the increase in CO2 emissions in a particular year !!

[alancalverd]

Fluctuations are weather. The frequency and intensity of fluctuations is climate: the difference between British cold sector "sunshine and showers" and an annual monsoon.

[Bored chemist]

The frequency and intensity of fluctuations is climate:

That's interesting.
I think most people would say that climate is related to "the average".
So, for example, Edinburgh has a colder climate than London, or it's to do with annual rainfall, not today's- or this year's- rain
But you don't seem to think that counts.
Well, it's an unorthodox  definition of climate.
But, ignoring what most people think the word means, does give you a way to say that  we can't measure "climate change" or blame it on mankind's activity.