If Bitcoin is open source as proponents mention, why can't make Bitcoin as environmentally friendly as Ripple, Dogecoin, Cardono etc.
Changes to Bitcoin protocol are proposed as BIPs, discussed, implemented and used if enough consenus with soft forks as mentioned in an answer to one of the question you asked previously: Who approves the feature and bug code reviews in Bitcoin?
Nothing in the Bitcoin protocol stops people from creating better ASICs, using renewable energy sources, recycling ASIC heat etc.
In fact there are some people who are involved in some of these things instead of virtue signalling on social media: https://braiins.com/blog/green-innovation-in-bitcoin-mining-recycling-asic-heat
Why XYZ features of some altcoin are not available in Bitcoin is already answered in one of the questions you asked previously:
Will Bitcoin copy Best Features of Litecoin, Ripple, if its Open Source?
I am also curious why some of the altcoins use chains of block for scamming and not just SQL database or Google Sheets API. They could save some energy.
Elon Musk tanked the market by mentioning Dogecoin is More environmentally friendly
10-15% moves are not big in BTCUSD considering the overall volatility. The price has gone 10x in last one year. Tesla has dumped 25% in last couple of weeks, is it because of his tweets? Speculating why price moves up or down every day is not something I want to discuss on Bitcoin Stackexchange.
It apparently uses an algorithm that takes less computation and energy consumption.
This is not true as mentioned by sipa in comments.
Source Code reference:
This is not the source code for Bitcoin. This is the repository for one of the implementation for Bitcoin: Bitcoin Core
KWh consumed per transaction
This makes no sense.