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And how many people have or will have handsets in the near future? If it is 3 billion people and we can reduce the power consumption by 25%, it would be a lot.

And how many people have or will have handsets in the near future? If it is 3 billion people and we can reduce the power consumption by 25%, it would be a lot. Reduction in data center usage of power is the other part. $5 a year of electricity per phone sounds low, but maybe you can share where you got that number?

systoll 4y ago
$5/year is an extremely high estimate. A phone with a 5000mAh battery (more than any iPhone) takes about 20 watt hours of power to charge. Charging it from empty to full each day would use about 7.3 kWh per year. Electricity costs about 15c per kWh.
- horsawlarway 4y ago
  Correct - I used $5 because I KNEW it would cost less even in countries with very high electric costs, and for power hungry phones. The last good data I can find (2019) puts the average right around $0.90/year for US based phone users.
horsawlarway 4y ago
> If it is 3 billion people and we can reduce the power consumption by 25%, it would be a lot. Honestly - not really. Yes, it's large in the abstract sense that it's a very tiny number multiplied by a large number, so it appears large compared to the original tiny number - but in terms of practical impact, it's SO VERY FAR down the list of approaches to reducing climate change. A year's worth of smartphone usage will generate about ~5 lbs of CO2. Driving a car ~5 miles (at an average of ~21mpg, or 411 grams CO2/mile) will generate the same CO2. The average commute in the US is 41 miles round trip - so every day, the average commuter burns 8 years worth of smartphone usage in a CO2 budget by driving their car. This is getting really back of the napkins-esque (since not all people work/commute) but if we just assume that in general the US population is driving - at ~330 million people, times 8... we get 2.63 billion. Basically - each day, driving in the US is generating close to the same CO2 that all 3 billion of those smartphone users will generate in a YEAR. Looks like roughly 1/3 of US pop actually commutes, so we'll be generous and say that every 3 days, we blow through the yearly carbon generation for ALL 3 billion of those smartphone users. It's just a really, really tiny number compared to other initiatives. You're MUCH better off tackling basically anything else. There is SO much better low hanging fruit. A week long "don't drive" mandate in the US earns the whole world years of smart phone usage. Go argue against "back to the office" policies instead - you'll do far more good.

systoll 4y ago

$5/year is an extremely high estimate. A phone with a 5000mAh battery (more than any iPhone) takes about 20 watt hours of power to charge. Charging it from empty to full each day would use about 7.3 kWh per year. Electricity costs about 15c per kWh.

horsawlarway 4y ago
Correct - I used $5 because I KNEW it would cost less even in countries with very high electric costs, and for power hungry phones. The last good data I can find (2019) puts the average right around $0.90/year for US based phone users.

horsawlarway 4y ago

> If it is 3 billion people and we can reduce the power consumption by 25%, it would be a lot. Honestly - not really. Yes, it's large in the abstract sense that it's a very tiny number multiplied by a large number, so it appears large compared to the original tiny number - but in terms of practical impact, it's SO VERY FAR down the list of approaches to reducing climate change. A year's worth of smartphone usage will generate about ~5 lbs of CO2. Driving a car ~5 miles (at an average of ~21mpg, or 411 grams CO2/mile) will generate the same CO2. The average commute in the US is 41 miles round trip - so every day, the average commuter burns 8 years worth of smartphone usage in a CO2 budget by driving their car. This is getting really back of the napkins-esque (since not all people work/commute) but if we just assume that in general the US population is driving - at ~330 million people, times 8... we get 2.63 billion. Basically - each day, driving in the US is generating close to the same CO2 that all 3 billion of those smartphone users will generate in a YEAR. Looks like roughly 1/3 of US pop actually commutes, so we'll be generous and say that every 3 days, we blow through the yearly carbon generation for ALL 3 billion of those smartphone users. It's just a really, really tiny number compared to other initiatives. You're MUCH better off tackling basically anything else. There is SO much better low hanging fruit. A week long "don't drive" mandate in the US earns the whole world years of smart phone usage. Go argue against "back to the office" policies instead - you'll do far more good.