Climate change : Future Perfect and environmental impact

Analyze the climate data and complete the following tasks: The average global temperature has risen by $0.85^\circ\text{C}$ since the late 19th century. Scientists project an additional increase of $2.5^\circ\text{C}$ by the year $2100$.

1. Translate this sentence into English using the Future Perfect tense: 'D'ici la fin du siècle, l'humanité aura augmenté la température mondiale d'un total de $3.35^\circ\text{C}$.'
2. Write a paragraph of $50$ to $80$ words explaining the environmental impact of this $3.35^\circ\text{C}$ rise. You must use at least two modals of probability (must, might, could) and integrate specific vocabulary: 'melting ice caps', 'rising sea levels', and 'endangered species'.