The graph shows how the percentage of carbon dioxide in the atmosphere has changed since the year 1700. [Graph showing % carbon dioxide vs year from 1700 to 2050]

Mark scheme

Marking points from the official mark scheme (Oct/Nov 2018). The mark or mark type is shown in brackets.

1. [5] rise in population ; any named human invention requiring an energy supply ; burning / combustion ; fossil fuels / coal / oil / gas ; production / release + of carbon dioxide ; deforestation / fewer trees / fewer plants ; less / no + absorption / uptake / use + of carbon dioxide ; less / no + photosynthesis ; decomposition / decay ; respiration ;
2. [5] greenhouse + gas / effect ; global warming ; any three further marks from: extreme weather AW / flood / drought / storms AW / heat waves ; loss of + homes / habitat / life / crops / land / soil / food / income ; ice melting ; rise in sea levels ; migration ; invasive species more successful ; extinction ; water AW + warms / changed currents / acidified / oxygen depletion ; changed distribution + disease / vectors of disease (e.g. mosquito) ;