I agree no such app can do much other than provide entertainment, but that doesn’t mean people can’t a fell for their impact.
However it is not that difficult to get a more sensible output.
Let’s consider a few things.
CO2 is just a climate related gas as is CH4 and H2O etc.
The generation of heat by any consumption increase the air temperature and thereby increases the H20 which is the main ingredient in cloud warming.
Not how much warmer the nights are when there it cloudy. Water clouds are far more effective in warming. Sure they are not so widely spread and have a short life but then CO2 in the atmosphere is no so ,long lasting as other pollutants.
Sure we can cut back on CO2 but that isn’t the issue.
We burnt lots of wood, then lots of coal and oil and now we use U238 and if we had not done that we wouldn’t be making Li batteries and Solar panels.
No matter what we use it will generate heat and add more moisture to the atmosphere. It may become so dominant that a long term covering of cloud could reduce sunlight arriving at the surface.
Human efforts in work, no matter what we do is energy transformation.
That most of this comes from sunlight is the common factor.
Our use of this resource via carbon base intermediaries is limited to a) what has been grown since plants got a footing, as in fossil fuels and that which is consumed from the seasonal growth.
Knowing that the fossil fuel created a spike in carbon use then we know that will run out.
We also attribute value to fuels and tools and hence money is a very accurate way of measuring a persons contribution to the overall warming and pollution of the environment.
So it’s all very easy: Don’t fuss over how much Carbon you may be using but money.
Reduce your use of money and all the rest reduces as you can’t buy as much
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You may even decide to cultivate some crops to eat,
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You may spend more time cycling and walking
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You may even make a generator from an old bike and alternator
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You may collect your own rain water
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You may reduce the size of your residence
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AND of course you may try and use you phone for much longer as now you spend time doing the above you use less time earning and spending money so the last thing you want to do is spend €600 every year or two.
It’s all so simple, just check your use of money form year to year and try and reduce that.