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At a rate of 550 a day it will take 20 years to get to 4M... By then you can buy all of the bitcoins for the price of a donut...

All people should try to live circulair, meaning that you take care of the waste you produce. When you go somewhere, do not leave your waste without properly disposing it so that it can be recycled. With the moon, we have a chance to start fresh. We massively polluted the earth, let's not start polluting the moon because it is to expensive to remove our waste. And it is idiotic to deliberately sent it there.

According to https://www.worldometers.info/... on average we put 4.79 tons of CO2 in the atmosphere per person (babies included) in the world (in 2016)... For a western person this is easily double that amount. Let's round that of to 10 ton of CO2 per person who can finance to off set their carbon footprint. It is much more in USA and Canada and less in Europe and other developped countries. As burning 1 liter of diesel produces 2.7 kg of CO2, 10 tons of CO2 is the equivalent of 3700 kg of diesel fuel. The average family of 2 adults, 2 kids uses about 15 tons of diesel to sustain their life style in a year. Including their direct use, but also all the energy used by factories and farms (fertilizer!) to produce buildings, transport and consumable goods and food. 15 tons of diesel per year is what it takes a family to live in our modern world and that should either be replaced with other sources of energy, or be produced as biofuel in a environmental neutral way. Alternatively we can try to sequester the amount of CO2 on a yearly basis to keep the balance. Biofuel has the advantage that our current infrastructure is based almost entirely on the use of liquid fuel. One way of producing biofuel is to grow algae. They naturally produce oily fats that can be used as diesel fuel. For this one needs sun light, water and nutrients (fertilizer). Ok, I researched the use of Algae to sequester CO2 a bit: Chlorella is a micro algae that would make an excellent candidate. It needs a few minerals, CO2, sunlight and water. People know it from aquaria that turn green, it is not difficult to cultivate. For every kg dry algae it takes about 2.7kg of CO2 out of the atmosphere. A production system could produce up to 0.4 grams per liter water per day. So what would it take to bind the amount of Co2 is produced per year per capita(person) in the world? In the western world about 10-12 tons of CO2 per capita per year. So we would need to produce around 4000kg of dry chlorella algae per person per year. We might be able to pump this back into old oil wells to permanently reduce CO2, but we can also just turn it into usable biodiesel or food, reuse it and keep the current levels. Per day per person we would need to produce 11kg of chlorella. This would take a volume of at least 27500 liters of water. Note that the water is not wasted entirely. Just a small amount is used for pumping algae out and evaporation etc. A whole system (bioreactor) to offset the footprint of a person could for example be build inside a 40ft seacontainer. Power consumption for pumps (Air needs to be pumped in) and (artificial) light is not free, also the minerals need to be resupplied( per year about 150 kg of minerals (f/2 medium)). One could attempt to just dump this amount of fertilizer in the ocean and hope that the algae there would do their best, but that proces is very hard to keep in control. Also it will be much harder to harvest biofuel from it. The catch is that 150kg of mineral fertilizer needed for the amount if produced algae per person per year is very expensive and not available at this scale in an environmentally neutral and economical way. Perhaps reusing the algae waste (digistate) as fertilizer (it contains all the minerals an algae needs) could work if we find a way to free up the minerals for new algae to grow...

In Amsterdam, the Netherlands we have waste separating machines which separate metal and plastics etc from garbage for recycling. The rest we burn, the exhaust is filtered and washed. The heat from the furnaces we use to generate electricity. The leftover ashes and slak we use for road construction. This is still not considered to be entirely "green", but landfills are not in use anymore in the Netherlands. Further more, there is a lot of effort to reduce waste. You can call a service that will pick up old furniture and other items (for example building materials) for free or minimal cost. They take care of re-use or disassembly for recycling. More than half of the waste is not burned, but recycled.

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