Create eip to cap gas limit (#3756)

* create eip to cap gas taret

* s/target/limit

* rename file

* clean up and add discussion link

* typo

EIPS/eip-3756.md

@@ -0,0 +1,55 @@
+---
+eip: 3756
+title: Gas Limit Cap
+description: Set an in-protocol cap for the gas limit
+author: lightclient (@lightclient)
+discussions-to: https://ethereum-magicians.org/t/eip-3756-gas-limit-cap/6921
+status: Draft
+type: Standards Track
+category: Core
+created: 2021-08-21
+---
+
+## Abstract
+
+Set an in-protocol cap for the gas limit of 30,000,000.
+
+## Motivation
+
+A high gas limit increases pressure on the network. In the benign case, it
+increases the size of the state and history faster than we can sustain. In the
+malicious case, it amplifies the devestation of certain denial-of-service
+attacks.
+
+## Specification
+
+As of the fork block `N`, consider blocks with a `gas_limit` greater than
+`30,000,000` invalid.
+
+## Rationale
+
+### Why Cap the Gas Limit
+
+The gas limit is currently under the control of block proposers. They have the
+ability to increase the gas limit to whatever value they desire. This allows
+them to bypass the EIP and All Core Devs processes in protocol decisions that
+may negatively affect the security and/or decentralization of the network.
+
+### No Fixed Gas Limit
+
+A valuable property of proposers choosing the gas limit is they can scale it
+down quickly if the network becomes unstable or is undergoing certain types of
+attacks. For this reason, we maintain their ability to lower the gas limit
+_below_ 30,000,000.
+
+## Backwards Compatibility
+No backwards compatibility issues.
+
+## Test Cases
+TBD
+
+## Security Considerations
+No security considerations.
+
+## Copyright
+Copyright and related rights waived via [CC0](https://creativecommons.org/publicdomain/zero/1.0/).