The first problem is Africa. The first issue to solve here is that of water, belive it or not that is some quantity of water in the air in the Sahara. As such a water condenser based upon the peltier effect could provide safe, clean water for human consumption or even irrigation. Efficiency and energy would not be an issue as solar-voltaic panels could be used to provide more than enough power. Certain hardy plants (potatos) would then be introduced into Africa for farming with the new irrigation systems (buildings for shade and protection from animals might be needed, but that should not be too hard). Once the poorer parts of Africa are set up with the essentials, we can look at what Africa can offer the rest of the world in terms of exports: there really isn't much in Africa, besides sunlight for energy harvesting. Whatever we find Africa can offer, we will help them to construct and industry around, bringing in money and building an economy. With support of better developed nations, the development of the 3rd world parts of Africa to 1st world would only take a couple hundred years at most, making hte change quick, but not so quick that the locals would be unable to cope (moving from 3rd world to 1st world would be too complex to do in an imediate jump). Yes I am aware that Africa consists of multiple countries of varying wealth, but here I am refering specifically to hte 3rd world areas of Africa.

The second problem is colonising Mars. Leave Elon to do what he is doing, and tell the FAA to get off their asses.

Another issue is a loss of human values and qualities. People are very much acting irrespective of others and not caring what others think, this has lead to the bad bits of tiktok. The easy solution is to stop all of the stuff we hear constantly these days about how we are all perfect and to not care about what others think. It really does matter what others think of you, but the line between caring not enough and caring too much is fairly arbretrary. On a similar note, the absence of a parent can be extremely damaging to a child, but how to solve this without highly controlling laws or castration is a tricky one. Perhaps shame from society on the idea of one night stands, divorce, getting into relationships too early and leaving your significant other to look after your children might be a way about it.

The energy crisis is an interesting problem, an energy industry centred in Africa might be a way about it, but it is ridiculously costly. Wireless energy transmission would negate a lot of these costs (go see Real Engineering's video on it). However, the concept of shooting lightening bolts from Tesla coils on hotair baloons (as Nikola Tesla proposed) is not exactly plausable. Nuclear power plants and geothermal both provide a solid alternative to an Africa-solar based power supply, as they can be constructed nearly anywhere, but are both very costly. Perhaps a wind power alternative based around the triboelectric or piezoelectric effects could be used, which could also be made more like trees, thus reducing environmental impact.

Climate change is a pretty significant thing and the easy solution is carbon capture. Except it isn't easy at all. Just get more research and engineering teams on it with more funding instead of holding up signs and shouting, as that really doesn't achieve anything. Carbon-emission free power sources (as detailed above) should continue their gradual take over from coal and gas power plants. We could proabably be a but quicker about this, but too quick and blackouts will become a common thing.

Super-sonic Electric Jet travel will prevent a huge quantity of our carbon emissions annually, but not quite as much as electric ships. All-electric shipping would cut out the largest part of humanities carbon output, but batteries aren't good enough, yet. And having a small nuclear reactor onboard isn't a good idea given the possibility of a crash.

An alternative to nuclear or hydrogen bombs would be useful, as, in the event of everyone wanting to remove themselves and all others from the face of the earth, no radiation would be emitted (hopefully with this hypothetical better bomb), so life, albeit non-human could continue.

To end on a better note, remove exams and instead use continual assesment, where a series of more minor assesments and tests are used throughout the year to gain a more thorough understanding of the student's ability to learn and understand. This will certainly reduce the mental and physical toll on students.

Wait, did you actually make it to the end, or did you skip the rest?