In a previous exercise, we created a tidy version of the co2 dataset: We want to see if the monthly trend is changing so we are going to remove the year effects and the plot the data. We will first...

In a previous exercise, we created a tidy version of the co2 dataset:

We want to see if the monthly trend is changing so we are going to remove the year effects and the plot the data. We will first compute the year averages. Use the group_by and summarize to compute the average co2 for each year. Save in an object called yearly_avg.