The current public Ethereum network has a hashrate that corresponds to a tremendous level of energy consumption. As this energy consumption has a correlated environmental cost the network participants have an ethical obligation to ensure this cost is not higher than necessary. At this time, the most direct way to reduce this cost is to lower the block reward in order to limit the appeal of ETH mining. Unchecked growth in hashrate is also counterproductive from a security standpoint.
The current public Ethereum network has a hashrate of 232 TH/s). This hashrate corresponds to a **lower bound** for power usage of roughly [821 MW](eip-858/calculations.md) and yearly energy consumption of 7.2 TWh (roughly 0.033% of [total](https://en.wikipedia.org/wiki/List_of_countries_by_electricity_consumption) global electricity consumption). A future switch to full Proof of Stake will solve this issue entirely. Yet that switch remains enough in the future that action should be taken in the interim to limit excess harmful side affects of the present network.
If any resulting hard forks need a name for that name to maybe be Perinthos.
## Rationale
partly TBD
The network hashrate provides security by reducing the likelihood that an adversary could mount a 51% attack. A static block reward means that factors (price) may be such that participation in mining grows unchecked. This growth may be counterproductive and work to also grow and potential pool of adversaries. The means we have to arrest this growth is to reduce the appeal of mining and the most direct way to do that is to reduce the block reward.
## Backwards Compatibility
This EIP is consensus incompatible with the current public Ethereum chain and would cause a hard fork when enacted. The resulting fork would allow users to chose between two chains: a chain with a block reward of 1 ETH/block and another with a block reward of 3 ETH/block. This is a good choice to allow users to make.
## Test Cases
Tests have, as yet, not been completed.
## Implementation
A [fork of the go repo](https://github.com/cslarson/go-ethereum/tree/reduce-block-reward) with changes to reflect a block reward reduced to 1 ETH, activated at a fork to be called Perinthos.
## Copyright
Copyright and related rights waived via [CC0](https://creativecommons.org/publicdomain/zero/1.0/).
