Merge pull request #6832 from jmcook1186/energy-image

adds energy expenditure graph to energy page

src/content/energy-consumption/index.md

@@ -38,6 +38,12 @@ More relevant is the overall energy consumption and carbon footprint of the netw
 
 [Digiconomist provides whole-network energy consumption and carbon footprints for Bitcoin and Ethereum](https://digiconomist.net/ethereum-energy-consumption). At the time of writing this article, Ethereum's total energy consumption is ~112 TWh/yr, comparable to that of the Netherlands, with a Carbon emission equivalent to that of Singapore (53 MT/yr). For comparison, Bitcoin currently expends about 200 TWh/yr of energy and emits about 100 MT/yr C, while generating about 32,000 T of electrical waste from obsolete hardware annually. Switching off Ethereum's proof-of-work in favor of proof-of-stake will reduce this energy expenditure by more than 99.95%, implying that the total energy expenditure for securing Ethereum is closer to **0.01 TWh/yr**.
 
+![Comparison of energy expenditure across industries](./energy.png)
+
+The figure above shows the annual energy consumption in TWh/yr for various industries (retrieved in June 2022).
+_Note that the estimates presented in the plot are from publicly available sources that have been linked to in the text below. They are
+illustrative and do not represent an official estimate, promise or forecast._
+
 To put Ethereum's energy consumption in context, we can compare annualized estimates for other industries. If we take Ethereum to be a platform for securely holding digital assets as investments, perhaps we can compare to mining gold, which has been estimated to expend about [240 TWh/yr](https://www.kitco.com/news/2021-05-17/Gold-s-energy-consumption-doubles-that-of-bitcoin-Galaxy-Digital.html). As a digital payments platform we could perhaps compare to PayPal (about [0.26 TWh/yr](https://app.impaakt.com/analyses/paypal-consumed-264100-mwh-of-energy-in-2020-24-from-non-renewable-sources-27261)). As an entertainment platform we could perhaps compare to the gaming industry which has been estimated to expend about [34 TW/yr](https://www.researchgate.net/publication/336909520_Toward_Greener_Gaming_Estimating_National_Energy_Use_and_Energy_Efficiency_Potential), or Netflix which expends about [94 TWh/yr](https://www.carbonbrief.org/factcheck-what-is-the-carbon-footprint-of-streaming-video-on-netflix), or Youtube which has been estimated to expend about [244 TWh/yr](https://thefactsource.com/how-much-electricity-does-youtube-use/). Estimates of Youtube's energy expenditure have been broken down by channel and individual videos. [Those estimates](https://thefactsource.com/how-much-electricity-does-youtube-use/) imply that people consumed 45 times more energy watching Gangnam Style in 2019 than proof-of-stake Ethereum will use in a year.
 
 ## A greener Ethereum {#green-ethereum}