Billionaire tax proposal - Commercial space station - Climate pledge shortcomings

Democrats are considering a new tax on billionaires that would help fund their proposed $3.2 trillion social spending package. The proposal would only impact taxpayers with more than $1 billion in assets, or those with incomes of more than $100 million for three consecutive years.
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A key change under the plan is that tradable assets, such as stocks, would be valued annually. Billionaires would be taxed on their gains whether they have sold the asset or not. Under current law, a gain is only taxed if it is "realized" — when its owner sells the asset and books the profit. [This proposal is not the same as a wealth tax] because this tax would be levied on annual gains, instead of a person's entire wealth.
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On Twitter, Tesla founder Elon Musk — the world's richest person, with an estimated wealth of $288 billion — warned that the tax could be expanded to hit additional taxpayers. Senate Republican leader Mitch McConnell called it a "harebrained scheme" and warned of revenue drying up during downturns.