Slide 1. Lower case s for sheep.
Slide titles use mix of capital initial letters and lower case.
CH4 should be subscripted throughout.
Slide 4. What is significance of SF6 yoke?
Slide 4. x axis label for left graph.
Slide 13. Graph layout a bit messy.
Slide 14. Title not accurate.
Slide 23. Title not informative.
Overall, this should be made to be a bit more uniform before it is presented.