Over 50 species 
   
 Although there are over 50 species of coffee, only 2 – Arabica and Robusta – are used in commercial coffee production. Arabica is the most popular. 70% prefer it to Robusta.
 
  The longer a bean is roasted – and the darker it becomes – the more caffeine evaporates. 
  The longer a bean is roasted – and the darker it becomes – the more caffeine evaporates. 
  The longer a bean is roasted – and the darker it becomes – the more caffeine evaporates. 
  Although there are over 50 species of coffee, only 2 – Arabica and Robusta – are used in commercial coffee production. Arabica is the most popular. 70% prefer it to Robusta. 
  Although there are over 50 species of coffee, only 2 – Arabica and Robusta – are used in commercial coffee production. Arabica is the most popular. 70% prefer it to Robusta.