Source files in a bash script

I am using two versions of ROS next to each other. To use one I have to source some environment variables for the specific version. I would like to create a script that does this. But if I create a script like below the variables are not set, they are probably set in a subshell. How can I source the files to the main terminal shell?

source.sh:

source /opt/ros/fuerte/setup.bash;
source  ~/fuerte_workspace/setup.bash;

Here is how i am calling source.sh:

./source.sh
# This does not echo anything, but I expect it should
echo $ros_config

---

Update: By sourcing source.sh as suggested in the answer, I can now see the variables being set.

source ./source.sh
# This works now
echo $ros_config

Execute Shell Script Using . ./ (dot space dot slash)

While executing the shell script using “dot space dot slash”, as shown below, it will execute the script in the current shell without forking a sub shell.

$ . ./setup.bash

In other words, this executes the commands specified in the setup.bash in the current shell, and prepares the environment for you.

Use dot notation to source in the script file in the current shell i.e. without creating a sub-shell:

. /opt/ros/fuerte/setup.bash
. ~/fuerte_workspace/setup.bash