We propose and solve an optimal vaccination problem within a deterministic compartmental model of SIRS type: the immunized population can become susceptible again, e.g. because of a not complete immunization power of the vaccine. A social planner thus aims at reducing the number of susceptible...

The Global Methane Pledge to reduce emissions by at least 30 per cent by 2030, was signed by more than 100 countries at the COP26 Conference in November 2021. Reducing methane emissions from fossil fuel sources by up to 75 per cent by 2030 has been identified as an essential contribution to...

The Global Methane Pledge to reduce emissions by at least 30 per cent by 2030, was signed by more than 100 countries at the COP26 Conference in November 2021. Reducing methane emissions from fossil fuel sources by up to 75 per cent by 2030 has been identified as an essential contribution to...