[R] change colour in barplot

[Maria Lathouri]

 Dear all
I know that it is a very simple question but it seems that I cannot change the colour in the bars.
I have the following dataframe: 
A                  B                 C           D          E                    F                    G                0.0.24          152460         474       5.5        612000           59061000       1540313
and here is the script:
setwd("~/Desktop")
emission<-read.csv("emission from land.csv")
attach(emission)
#define the formulas
Emission_from_Land<-A*B*C*DEmission_from_Access_Road<-E*(F/1000000)*CEmissions_from_well<-(G/1000000)*E*C
#combine my outputs into a new dataframe
dat<-cbind(Emission_from_Land, Emission_from_Access_Road, Emissions_from_well_pad)
#plot a barplot
barplot(dat, ylab="Kg-CO2 Eq", ylim=c(0.0e+00, 2e+10), axisnames=FALSE, col=c("blue", "red", "orange"), 
        main ="Well Site Construction Emissions", legend.text=c("Land", "Access", "Well"), 
        args.legend = list(x="bottom", horiz="TRUE", bty="n", inset=c(-0.5, -0.25)))
When I add the col= argument, the colour changes in the legend but not the actual bars in the plot. I don't know what I am doing wrong. I know that I am missing something but I cannot figure it out. 
I would very much appreciate for your help. 
Many thanks,Maria
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