Answer:
In order to successfully complete this exercise, you have to fill-in the blanks in the sentences with the correct form of the verbs provided in brackets in their subjunctive mood. <em>Note that you have to pay particular attention to the subject in each sentence in order to choose the correct inflection of the verb</em>.
Explanation:
Teme que <em>haya</em> (haber) una sobrepoblación en el continente (continent).
Ojalá que tú <em>puedas</em> (poder) respirar aire puro.
Es una lástima que nosotras no <em>reciclemos</em> (reciclar) el vidrio.
Me alegro de que el ecoturismo <em>conserve</em> (conservar) el medio ambiente.
Los expertos no creen que la energía solar <em>sea</em> (ser) la única solución.