Because with these conditions (the progress of science) and (the speed of population growth), Everything is somewhat vague.(Food supply discussion and so on)
It is simply the cycles of human life, any culture reaches the top shall regress and collapse, too many examples about that exists in the history of human kink (the culture of Rome, the culture of Anka, Pharaohs, Chinese.....), this is due to mankind behavior, with injustice and greedy, fall is expected in the next 50 years, with justice and rightness (which do not seem so), progress is expected.
Humanity is supposed to be in a continuous progress. There is advancement in all fields in different walks of life. But sometimes, with the conflicts and disputes that exist in different parts of the world, one may feel disappointed and pessimist about the future. One isn't completely sure about the future. Only ALLAH knows about what will happen in the future. Man cannot predict about it. Best regards.
Based ion what happened over the past 50 years, there will be more progress in the next 50 years. However, my concerns relate to the environment and the exploitations of less powerful nations.
Thank you for your helpful answers Dear Dr Amir_Al-Khafaji, Segun Michael Abegunde ,Saif Hosam Raheem ,Shibabrata Pattanayak ,Shibani Dash and Amit Baran Sharangi .