Through Starfarer, Kim Peart’s avatar in Second Life, he wonders why the youth of Earth don’t know where planet B is.
In Search of Planet B, and also Planet C
The youth of the Earth are marching, even out of school with strike action, and holding up boards that declare ~ "There is no planet B.” 
This is an odd statement to make, as there is a Planet B, which is nearly the size of Earth, but is very hot on the ground, and too hot for water.
Planet B is Venus, which is so hot, the rocks glow.
We could live at Venus, if we wanted to, in cities that float in the clouds, made of carbon mined from the air of Venus, or live in orbital space cities in space above the planet.
We could also make Venus cool, if we chose to, with the construction of an adjustable sunshade in space, which would double as a solar energy collector, providing power for industry on the ground, in the clouds, and in space around Venus.
We could transform Venus into a second Earth, if we had a mind to, by adding water, shipped in from across the Solar System.
It may take a million years to achieve, but Venus could be Planet B, if that’s what we would like for the future.
This raises a rather curly question.
If we can work out a plan to turn Venus into a second Earth, what is our problem on Earth?
The simple answer to that question, is that we would be working with Venus from above, from space, drawing on the power of the Sun in space to do the work.
To win back a safe Earth, and ensure that Planet A is healthy, we need to work from above, from space, drawing on the power of the Sun in space to do the work.
Is the Sun a reliable energy source?
Our star is the driver of all life on this planet, and has so much fuel in reserve, it will burn fiercely over the next 5 billion years, until expanding to the orbit of the Earth as a red giant star.
In space, where the Sun never sets, it is a virtually infinite energy well.
Solar power stations located closer to the Sun, would be harvesting a higher volume of energy.
With industry in space we could construct an adjustable sunshade above the Earth, to cool the planet.
The Earth will one day turn into a second Venus, as the Sun gets hotter, and that will be the end of life on third rock.
By building a sunshade in space we will be able to extend the tenure of life on Earth by billions of years.
As the Sun gets hotter, future generations will simply need to strengthen the Earth’s sunshade.
A sunshade above the Earth, as suggested for Venus, can double as a solar energy collector, providing power for space industry and Earth needs.
With the power of the Sun, we can extract excess carbon dioxide from the air, to stop it heating up the planet.
Carbon dioxide is also absorbed into the sea, where it is making the oceans more acidic.
Even when cooling the Earth with a sunshade in space, we must extract excess carbon from the air and sea, so that the rising acidity in the sea can be turned down.
As carbon dioxide is taken out of the air, it will begin to come out of the sea and back into the air.
Sadly, so sadly, too much life will be lost before we can turn the tide on species extinctions and ecological damage.
The sooner we launch the work of using space to save the Earth, the sooner we can begin to win back a safe Earth.
Consider the moment in time when space industry becomes self-sufficient, when there is a sustainable industrial presence in space.
I call this the Liberty Line, beyond which there will be no further real cost to space development or construction. 
Beyond the Liberty Line we would be able to build any number of orbital space settlements, each generating an Earth gravity via rotation. 
Having an Earth gravity home in space will allow an easy return to Earth.
Imagine being born on Mars and wishing to visit Earth, a planet with three times the gravity of Mars.
It may not be possible to make that trip due to health and safety reasons.
Earth gravity space settlements located above Mars would allow the denizens of space to visit Mars, the Moon and Earth, as well as the asteroids.
We solved the problem of finding Planet B, but how about Planet C?
We can create land area in orbital space cities and settlements thousands of times greater than the land area of Earth, and beyond the Liberty Line, there will be no real cost involved.
We know where to get the power, but where will the raw materials come from?
There are near-Earth asteroids, the Moon, Mars, the Asteroid Belt, as many asteroids again in Jupiter’s La Grange areas, and literally trillions of objects scattered half way to the nearest star, where there may even be another Earth sized planet in the Kuiper Belt, or the Oort Cloud.
There may also be as many objects flying between the stars as there are in orbit around stars.
Last year an asteroid from deep space came sailing around the Sun, and more recently an interstellar comet arrived in the Solar System. 
Once we win the ability to build orbital habitats in space, we would be able to construct enough living space in space for all the people of Earth, in case of a planet emergency, and the shuttlecraft to provide transport.
That Earth crisis could be a monster asteroid, too big to turn aside, or mine into oblivion.
Space habitats can be moved out of the path of danger, but we cannot move the Earth.
As the Earth gets hotter, and more hostile to humans, we will end up living on this planet as if we were living in space, simply to survive.
If we rise to the challenge, we can make a Giant Leap to the Liberty Line, greatly improving our cosmic survival options.
Securing a sustainable industrial presence in space could be achieved using mini robots and remote control systems, from Earth and also from protected stations in space.
In space mini robots can do the work of mining and construction, and the building of larger robots for the construction of human scale cities among the stars.
When living space in space is declared safe, then humans could move in.
Mini robots will cost much less to send into space, cutting the cost of securing the Liberty Line.
In space we need to protect human habitats from solar and cosmic radiation, and also space rock of all sizes.
A meteoroid the size of a pinhead, when flying at high velocity in space, has a deadly punch on impact.
It is believed that a flake of paint, flying in space at high velocity, chipped the window of the International Space Station. 
One of the key needs in space is to keep space clean of human junk and space debris, which is possible with unlimited power from the Sun to do the work.
There is a huge amount of space junk above our planet, which needs to be cleaned up by industry in space, as soon as possible.
Beyond the Liberty Line, any number of ocean cleaning robots can be built in space factories and sent to Earth to clean plastic from the oceans, and recycle the lot.
In space there would be no waste, because the power of the Sun would provide the energy needed to do the work of total recycling.
The space approach to waste can be applied to Earth, to have total recycling.
The power of the Sun could be beamed or cabled to Earth to help do the work of keeping the Earth clean.
The power of the Sun brought to Earth could also be used to extract excess carbon dioxide from the air, break the molecule into carbon and oxygen, and process the carbon into a useful resource for Earth and space industries.
Dealing with carbon dioxide is basic chemistry, but requires a huge amount of energy, which is available to us from the Sun.
With space we can save the Earth, and turn the problem of carbon dioxide pollution into a carbon resource.
Able to build any number of Earth gravity orbital space cities and settlements, anyone who would like to live in space, could.
To be friendly to the Earth, we may need to limit the number of people on the home planet, so that Mother Earth can recover and evolution continue.
We need to work on a management plan for planet Earth.
By winning the liberty of the Solar System, we will be able to look at the best plan for life on Earth, along with a management plan for the Solar System.
With access to the power of the Sun in space, we can design a Stellar Economy, where there is no poverty, where all citizens can enjoy a career, have creative work, receive a good income, and be assured of a home.
Rather than robots being a threat to work and income, all citizens would be working with robots to build a better world.
By sending poverty into history with space, we will be building peace on Earth.
It would be far better to win peace with space, than end up in a nuclear war on Earth.
There are no good outcomes from a nuclear war, but there are good outcomes from winning peace with space.
To win back a safe Earth, to win a future in space, we need to make a Giant Leap to the Liberty Line.
We need to build Planet C, with orbital space habitats, so we can save Planet A, our Earth.
Then if we wish to, we can turn Planet B, Venus, into a second Planet A.
On Earth alone our future is limited, like that of the dinosaurs.
Are we smarter than the dinosaurs?
 National School Strike for Climate sees students across the country planning to skip school
Rhiannon Shine, 20 September 2019, ABC News Online